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Sentry Expert (BTD6): Difference between revisions

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==Mechanics==
==Mechanics==
When an Engineer Monkey with Sentry Expert is about to deploy a Sentry, it determines the Sentry type using a system that evaluates the types of all Bloons and Sentries on the map at that moment, then assigns a score to each Sentry type based on that. Only the outer layers of Bloons are taken into consideration, and [[Camo Bloon (BTD6)|Camo Bloon]]s count even if the Engineer Monkey doesn't have [[Camo detection]], though it ignores Bloon types that aren't part of the default roundset (such as [[Boss Bloon]]s and ''[[Frontier Legends]]'' Bloons). Sentries placed by other Sentry Expert Engineer Monkeys affect its scores in the same way as its own Sentries. It calculates the score of each Sentry type in the following steps:
When an Engineer Monkey with Sentry Expert is about to deploy a Sentry, it assigns a score to each type of Sentry based on the types of all Bloons and Sentries on the map at that moment (including Sentries placed by other Sentry Expert Engineer Monkeys), then deploys the Sentry type with the highest score it determined. It only considers the outer layers of Bloons, and does count [[Camo Bloon (BTD6)|Camo Bloon]]s even if the Engineer Monkey doesn't have [[Camo detection]]. It calculates the score of each Sentry type in the following steps:


#The Sentry type's score changes based on the proportions of Bloons currently on the map (the percentage of Bloons of each type out of the total number of Bloons). This works by applying a multiplier to the proportions of Bloon types, then adding those to its score modifiers. Each Sentry type has its own score multipliers for specific Bloon types, which can be positive or negative; it ignores Bloon types it doesn't have a multiplier for, but they still count towards the total number of Bloons when determining proportions.
#The Sentry type's score changes based on the proportions of Bloons currently on the map (the percentage of Bloons of each type out of the total number of Bloons). This works by applying a multiplier to the proportion of each Bloon type it checks for, then adding those to its score modifiers. Each Sentry type has separate score multipliers the Bloon types it checks for, which can be positive or negative; it doesn't check for Bloon types that it doesn't have multipliers for, but they still count towards the total number of Bloons when determining proportions, even [[Boss Bloon]]s and ''[[Frontier Legends]]''-exclusive Bloons.
#*For example, Boom Sentry applies 1× score to [[Lead Bloon (BTD6)|Lead Bloon]]s, -1× score to [[Black Bloon (BTD6)|Black Bloon]]s, and -0.5× score to [[MOAB (BTD6)|MOAB]]s; if there are 60 Lead Bloons, 20 Black Bloons, 20 MOABs, and no other Bloons of any type on-screen, Boom Sentry has +0.6 score from Lead Bloons, -0.2 score from Black Bloons, and -0.1 score from MOABs.
#*For example, Boom Sentry applies 1× score to [[Lead Bloon (BTD6)|Lead Bloon]]s, -1× score to [[Black Bloon (BTD6)|Black Bloon]]s, and -0.5× score to [[MOAB (BTD6)|MOAB]]s; if there are 60 Lead Bloons, 20 Black Bloons, 20 MOABs, and no other Bloons of any type on-screen, Boom Sentry has +0.6 score from Lead Bloons, -0.2 score from Black Bloons, and -0.1 score from MOABs.
#*In this scenario, if there are also 100 [[Purple Bloon (BTD6)|Purple Bloon]]s on-screen, it effectively halves all of these score modifiers, since half of the proportion of Bloons on the map are ones that don't affect the score of Boom Sentry.
#*In this scenario, if there are also 100 [[Purple Bloon (BTD6)|Purple Bloon]]s on-screen, it effectively halves all of these score modifiers, since half of the proportion of Bloons on the map are ones that don't affect the score of Boom Sentry.
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#*Boom Sentry: +1.5 if there are fewer Boom Sentries than Cold Sentries and at least 20 Pinks
#*Boom Sentry: +1.5 if there are fewer Boom Sentries than Cold Sentries and at least 20 Pinks
#*Cold Sentry: +1.5 if there are fewer Cold Sentries than Boom Sentries and at least 20 Pinks
#*Cold Sentry: +1.5 if there are fewer Cold Sentries than Boom Sentries and at least 20 Pinks
#*Energy Sentry: -4 if there are no Crushing Sentries, no Cold Sentries, and at least 10 MOABs
#*Energy Sentry: -4 if there are zero Crushing Sentries or zero Cold Sentries, and at least 10 MOABs
#The average of all the Sentry type's score modifiers up until this point becomes the base score.
#The average of all the Sentry type's score modifiers up until this point becomes the base score.
#*For example, if the Boom Sentry's score modifiers are +0.6 from Leads, -0.2 from Blacks, -0.1 from MOABs, and +1.5 from its special condition, its base score is 0.6. If the special condition is not met, its score modifier doesn't factor into the average, so the base score becomes 0.1 instead.
#*For example, if the Boom Sentry's score modifiers are +0.6 from Leads, -0.2 from Blacks, -0.1 from MOABs, and +1.5 from its special condition, its base score is 0.6. If the special condition is not met, its score modifier doesn't factor into the average, so the base score becomes 0.1 instead.
#Finally, the base score lowers by 1% per Sentry of that type that currently exists on the map. For example, if Boom Sentry has a base score of 0.6 and there are already three Boom Sentries on the map, its score becomes 0.582.
#Finally, the base score lowers by 1% per Sentry of that type that currently exists on the map. For example, if Boom Sentry has a base score of 0.6 and there are already three Boom Sentries on the map, its score becomes 0.582.


The Sentry with the highest score is chosen. If the highest score is tied, it prioritizes Crushing Sentry, Boom Sentry, Cold Sentry, or Energy Sentry, in that order.
If the highest score is tied, it prioritizes Crushing Sentry, Boom Sentry, Cold Sentry, or Energy Sentry, in that order.


===Score modifiers===
===Score modifiers===
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===Takeaways===
===Takeaways===
*Each Sentry type bases its priority on the proportions of specific Bloon types that are on the map, and any other Bloon types only matter for the total number of Bloons.
*Each Sentry type's priority depends on the proportions of specific Bloon types that are on the map, and can increase or decrease significantly if a special condition is met.
**Crushing Sentry gains priority from Purples and Ceramics, and gains extra priority if there are no Crushing Sentries and at least 15 Ceramics.
**Crushing Sentry gains priority from Purples and Ceramics, and gains extra priority if there are no Crushing Sentries and at least 15 Ceramics.
**Boom Sentry gains priority from Leads, loses priority from Blacks and MOABs, and gains extra priority if there are fewer Boom Sentries than Cold Sentries and at least 20 Pinks.
**Boom Sentry gains priority from Leads, loses priority from Blacks and MOABs, and gains extra priority if there are fewer Boom Sentries than Cold Sentries and at least 20 Pinks.
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***Effectively, if there are at least 20 Pinks and there aren't enough other Bloon types for other Sentry types to take priority, it attempts to balance the number of Boom Sentries and Cold Sentries evenly instead of going all-in on Cold Sentries.
***Effectively, if there are at least 20 Pinks and there aren't enough other Bloon types for other Sentry types to take priority, it attempts to balance the number of Boom Sentries and Cold Sentries evenly instead of going all-in on Cold Sentries.
**Energy Sentry gains priority from all MOAB-Class Bloons (including DDTs, even if it can't detect them), loses priority from Purples, and loses extra priority if there are at least 10 MOABs and no Crushing Sentries or Cold Sentries.
**Energy Sentry gains priority from all MOAB-Class Bloons (including DDTs, even if it can't detect them), loses priority from Purples, and loses extra priority if there are at least 10 MOABs and no Crushing Sentries or Cold Sentries.
***Effectively, if there are at least 10 MOABs and not enough other Sentries to handle their Ceramic children, it pre-emptively de-prioritizes Energy Sentries until at least one Crushing Sentry and one Cold Sentry are up.
***Effectively, if there are many MOABs and not enough of the other Sentry types to handle their Ceramic children, it pre-emptively de-prioritizes Energy Sentries until at least one Crushing Sentry and one Cold Sentry are ready. This doesn't happen with any other MOAB-Class Bloons, even though DDTs also have Ceramic children.
*All Sentry types slightly lose priority based on how many of them already exist on the map.
*All Sentry types lose priority based on how many of them already exist on the map, though the difference this makes is very minor unless there are many Sentry Expert Engineer Monkeys on the map.
**Because of this and that it prioritizes Crushing Sentry, Boom Sentry, Cold Sentry, or Energy Sentry, in that order, if there are no Bloons on-screen that can modify scores, it cycles through each Sentry type in order.
**Because of this, and that it prioritizes Sentries in a specific order if the highest score is tied, it naturally cycles through each Sentry type in order if there are no Bloons on-screen that can modify scores (though attack speed modifiers, or other ways of adding and removing Sentries, can break the order).


==Sentries==
==Sentries==
Sentries get the following benefits from [[crosspath]]ing:
Sentries get the following benefits from [[crosspath]]ing:
*[[Larger Service Area (BTD6)|Larger Service Area]] increases the Sentries' [[range]] by +4.
*[[Larger Service Area (BTD6)|Larger Service Area]] increases the Sentries' [[range]] by +4.
*[[Deconstruction (BTD6)|Deconstruction]] allows the Sentries to deal +1 damage to [[MOAB-Class Bloon (BTD6)|MOAB-Class Bloon]]s and +1 damage to [[Fortified Bloon (BTD6)|Fortified Bloon]]s (+2 in total to Fortified MOAB-Class).
*[[Deconstruction (BTD6)|Deconstruction]] allows the Sentries to deal +1 damage to [[MOAB-Class Bloon]]s and +1 damage to [[Fortified Bloon (BTD6)|Fortified Bloon]]s (+2 in total to Fortified MOAB-Class). For Energy Sentries, this stacks with their inherent extra damage to MOAB-Class Bloons.
*[[Oversize Nails (BTD6)|Oversize Nails]] increases the Sentries' [[pierce]] by 50% from the base amount.
*[[Oversize Nails (BTD6)|Oversize Nails]] increases the Sentries' [[pierce]] by 50% from the base amount.
*[[Pin (BTD6)|Pin]] allows the Sentries to stun Bloons for 1 second (except the Cold Sentry).
*[[Pin (BTD6)|Pin]] allows the Sentries (except Cold Sentries) to stun Bloons for 1 second upon popping their outer layers.


=== Crushing Sentry ===
=== Crushing Sentry ===
[[File:BTD6 SentryCrushingPortrait.png|right|50px]]
[[File:BTD6 SentryCrushingPortrait.png|right|50px]]
The '''Crushing Sentry''' fires spiked balls every 1.2 seconds that can bounce off blockers, similarly to [[Spike-o-pult (BTD6)|Spike-o-pult]]; however, they'll not rehit Bloons after bouncing off obstacles. Each spiked ball can pop up to 22 Bloons per shot (33 with [[Oversize Nails (BTD6)|Oversize Nails]]). It deals 2 [[damage]], +4 to [[Ceramic Bloon (BTD6)|Ceramic Bloon]]s, and has the {{BTD6 dt|Shatter}} damage type (can pop [[frozen]] Bloons but not [[Lead Bloon (BTD6)|Lead Bloon]]s).
The '''Crushing Sentry''' fires spiked balls every 1.2 seconds that can bounce off blockers, similarly to [[Spike-o-pult (BTD6)|Spike-o-pult]], except they can't rehit Bloons after bouncing. Each spiked ball can pop up to 22 Bloons per shot (33 with [[Oversize Nails (BTD6)|Oversize Nails]]). It deals 2 [[damage]], +4 to [[Ceramic Bloon (BTD6)|Ceramic Bloon]]s, and deals {{BTD6 dt|Shatter}}-type damage (can damage [[frozen]] Bloons but not [[Lead Bloon (BTD6)|Lead Bloon]]s).
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=== Boom Sentry ===
=== Boom Sentry ===
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=== Cold Sentry ===
=== Cold Sentry ===
[[File:BTD6 SentryColdPortrait.png|right|50px]]
[[File:BTD6 SentryColdPortrait.png|right|50px]]
The '''Cold Sentry''' fires ice bombs every 1.5 seconds that explode on contact, similar to [[Cryo Cannon (BTD6)|Cryo Cannon]]. Its explosion has 18 radius, dealing 1 damage and freezes up to 24 Bloons (36 with [[Oversize Nails (BTD6)|Oversize Nails]]) for 1.5 seconds, and inflicts [[Permafrost (effect)|Permafrost]] (50% slowdown for infinite duration). Both the freeze and Permafrost effects soak up to 2 layers. It does not damage or freeze White Bloons, Lead Bloons, frozen Bloons, or [[MOAB-Class Bloon]]s, and will never target MOAB-class Bloons.
The '''Cold Sentry''' fires ice bombs every 1.5 seconds that explode on contact, similar to [[Cryo Cannon (BTD6)|Cryo Cannon]]. Its explosion has 18 radius, deals 1 damage, has 24 pierce (36 with [[Oversize Nails (BTD6)|Oversize Nails]]), freezes 2 layers for 1.5 seconds, and applies [[Permafrost (effect)|Permafrost]] (50% speed reduction for 2 layers). It does not damage or freeze White Bloons, Lead Bloons, frozen Bloons, or [[MOAB-Class Bloon]]s, and will never target MOAB-Class Bloons.
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