Sentry Expert (Battles 2): Difference between revisions

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When first upgraded to Sentry Expert, it instantly spawns four of these Sentries around its range.

==Sentries==

Usually, the Sentry Expert spawns Crushing, Boom, Cold, and Energy Sentries in that order. However, some sentries are skipped if certain Bloons appear on screen, and conversely some sentries are prioritized.

Sentries get the following benefits from [[crosspath]]ing:

*[[Larger Service Area (Battles 2)|Larger Service Area]] increases the Sentries' [[range]] by +4.

*[[Deconstruction (Battles 2)|Deconstruction]] allows the Sentries to deal +1 damage to [[MOAB-Class Bloon (Battles 2)|MOAB-Class Bloon]]s and +1 damage to [[Fortified Bloon (Battles 2)|Fortified Bloon]]s (+2 in total to Fortified MOAB-Class).

*[[Oversize Nails (Battles 2)|Oversize Nails]] increases the Sentries' [[pierce]] by 25% from the base amount, rounded up.

*[[Pin (Battles 2)|Pin]] allows the Sentries to stun Bloons for 1 second (including the Cold Sentry).

{|class="wikitable"

!Type

!Always prioritized against

!Prioritized against

!Skipped against

!Always skipped against

|-

!Crushing Sentry

|[[Ceramic Bloon (Battles 2)|Ceramic Bloon]]s

|[[Black Bloon (Battles 2)|Black Bloon]]s, [[White Bloon (Battles 2)|White Bloon]]s

|[[Lead Bloon (Battles 2)|Lead Bloon]]

|

|-

!Boom Sentry

|

|[[Lead Bloon (Battles 2)|Lead Bloon]]s, [[White Bloon (Battles 2)|White Bloon]]s

|[[Black Bloon (Battles 2)|Black Bloon]]s

|

|-

!Cold Sentry

|

|[[Lead Bloon (Battles 2)|Lead Bloon]]s, [[Black Bloon (Battles 2)|Black Bloon]]s

|[[White Bloon (Battles 2)|White Bloon]]s

|

|-

!Energy Sentry

|

|[[Black Bloon (Battles 2)|Black Bloon]]s, [[White Bloon (Battles 2)|White Bloon]]s

|[[Lead Bloon (Battles 2)|Lead Bloon]]s

|[[Purple Bloon (Battles 2)|Purple Bloon]]s

|}

=== Crushing Sentry ===

[[File:BTDB2 sentry crushing portrait.png|right|90px]]

The '''Crushing Sentry''' fires spiked balls every 1.1 seconds that can bounce off blockers, similarly to [[Spike-o-pult (Battles 2)|Spike-o-pult]]; however, they'll not rehit Bloons after bouncing off obstacles. Each spiked ball can pop up to 16 Bloons per shot (20 with [[Oversize Nails (Battles 2)|Oversize Nails]]). It deals 2 [[damage]], +1 to [[Ceramic Bloon (Battles 2)|Ceramic Bloon]]s, and have the {{BTDB2 dt|Sharp}} damage type (cannot pop [[Frozen]] Bloons or [[Lead Bloon (Battles 2)|Lead Bloon]]s).

=== Boom Sentry ===

[[File:BTDB2 sentry boom portrait.png|right|90px]]

The '''Boom Sentry''' fires bombs every 0.9 seconds that explode on contact. Its explosion has 18 radius, dealing 2 damage and can pop up to 30 Bloons (38 with [[Oversize Nails (Battles 2)|Oversize Nails]]). Explosions pop [[frozen]] Bloons and [[Lead Bloon (Battles 2)|Lead Bloons]], but not [[Black Bloon (Battles 2)|Black Bloons]].

=== Cold Sentry ===

[[File:BTDB2 sentry cold portrait.png|right|90px]]

The '''Cold Sentry''' fires ice bombs every 1.5 seconds that explode on contact, similar to [[Cryo Cannon (Battles 2)|Cryo Cannon]]. Its explosion has 12 radius, dealing 1 damage and freezes up to 15 Bloons (19 with [[Oversize Nails (Battles 2)|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.

=== Energy Sentry ===

[[File:BTDB2 sentry energy portrait.png|right|90px]]

The '''Energy Sentry''' fires lasers every 0.57 seconds. It deals 2 damage, and can pop 8 bloons (10 with [[Oversize Nails (Battles 2)|Oversize Nails]]). It can damage frozen Bloons, but not Lead Bloons or Purple Bloons. Compared to other specialized sentries, its lasers have the fastest projectile speed (280 units/second), but still slower than the main nailgun.

==Costs and sell values==

==Strategy==

Sentry Expert is effective at acting reactively against Bloon rushes and early MOAB rushes, making it stand out between rounds 11-19. The specialized sentries are often enough to take down most rushes after the initial burst of sentry production, and Sentry Expert stabilizes with a full army of normally produced sentries by the end of the burst. However, against round 11, it can be a significant money investment for Engineer-based defenses to buy Sentry Expert for that round, due to needing to buy it and camo detection to compensate for the latter weakness.

4-0-1 and 4-0-2 are generally preferred for the pierce bonus, as these upgrades allow the Sentry Expert to take down rushes more reliably.

==Update history==

@@ Line 17: / Line 17: @@
 When first upgraded to Sentry Expert, it instantly spawns four of these Sentries around its range.
+==Sentries==
+Usually, the Sentry Expert spawns Crushing, Boom, Cold, and Energy Sentries in that order. However, some sentries are skipped if certain Bloons appear on screen, and conversely some sentries are prioritized.
+Sentries get the following benefits from [[crosspath]]ing:
+*[[Larger Service Area (Battles 2)|Larger Service Area]] increases the Sentries' [[range]] by +4.
+*[[Deconstruction (Battles 2)|Deconstruction]] allows the Sentries to deal +1 damage to [[MOAB-Class Bloon (Battles 2)|MOAB-Class Bloon]]s and +1 damage to [[Fortified Bloon (Battles 2)|Fortified Bloon]]s (+2 in total to Fortified MOAB-Class).
+*[[Oversize Nails (Battles 2)|Oversize Nails]] increases the Sentries' [[pierce]] by 25% from the base amount, rounded up.
+*[[Pin (Battles 2)|Pin]] allows the Sentries to stun Bloons for 1 second (including the Cold Sentry).
+{|class="wikitable"
+!Type
+!Always prioritized against
+!Prioritized against
+!Skipped against
+!Always skipped against
+|-
+!Crushing Sentry
+|[[Ceramic Bloon (Battles 2)|Ceramic Bloon]]s
+|[[Black Bloon (Battles 2)|Black Bloon]]s, [[White Bloon (Battles 2)|White Bloon]]s
+|[[Lead Bloon (Battles 2)|Lead Bloon]]
+|
+|-
+!Boom Sentry
+|
+|[[Lead Bloon (Battles 2)|Lead Bloon]]s, [[White Bloon (Battles 2)|White Bloon]]s
+|[[Black Bloon (Battles 2)|Black Bloon]]s
+|
+|-
+!Cold Sentry
+|
+|[[Lead Bloon (Battles 2)|Lead Bloon]]s, [[Black Bloon (Battles 2)|Black Bloon]]s
+|[[White Bloon (Battles 2)|White Bloon]]s
+|
+|-
+!Energy Sentry
+|
+|[[Black Bloon (Battles 2)|Black Bloon]]s, [[White Bloon (Battles 2)|White Bloon]]s
+|[[Lead Bloon (Battles 2)|Lead Bloon]]s
+|[[Purple Bloon (Battles 2)|Purple Bloon]]s
+|}
+=== Crushing Sentry ===
+[[File:BTDB2 sentry crushing portrait.png|right|90px]]
+The '''Crushing Sentry''' fires spiked balls every 1.1 seconds that can bounce off blockers, similarly to [[Spike-o-pult (Battles 2)|Spike-o-pult]]; however, they'll not rehit Bloons after bouncing off obstacles. Each spiked ball can pop up to 16 Bloons per shot (20 with [[Oversize Nails (Battles 2)|Oversize Nails]]). It deals 2 [[damage]], +1 to [[Ceramic Bloon (Battles 2)|Ceramic Bloon]]s, and have the {{BTDB2 dt|Sharp}} damage type (cannot pop [[Frozen]] Bloons or [[Lead Bloon (Battles 2)|Lead Bloon]]s).
+{{clear|right}}
+=== Boom Sentry ===
+[[File:BTDB2 sentry boom portrait.png|right|90px]]
+The '''Boom Sentry''' fires bombs every 0.9 seconds that explode on contact. Its explosion has 18 radius, dealing 2 damage and can pop up to 30 Bloons (38 with [[Oversize Nails (Battles 2)|Oversize Nails]]). Explosions pop [[frozen]] Bloons and [[Lead Bloon (Battles 2)|Lead Bloons]], but not [[Black Bloon  (Battles 2)|Black Bloons]].
+{{clear|right}}
+=== Cold Sentry ===
+[[File:BTDB2 sentry cold portrait.png|right|90px]]
+The '''Cold Sentry''' fires ice bombs every 1.5 seconds that explode on contact, similar to [[Cryo Cannon (Battles 2)|Cryo Cannon]]. Its explosion has 12 radius, dealing 1 damage and freezes up to 15 Bloons (19 with [[Oversize Nails (Battles 2)|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.
+{{clear|right}}
+=== Energy Sentry ===
+[[File:BTDB2 sentry energy portrait.png|right|90px]]
+The '''Energy Sentry''' fires lasers every 0.57 seconds. It deals 2 damage, and can pop 8 bloons (10 with [[Oversize Nails (Battles 2)|Oversize Nails]]). It can damage frozen Bloons, but not Lead Bloons or Purple Bloons. Compared to other specialized sentries, its lasers have the fastest projectile speed (280 units/second), but still slower than the main nailgun.
+{{clear|right}}
 ==Costs and sell values==
 {{BTDB2 cost list by upgrade|Engineer Monkey|1|4}}
+==Strategy==
+{{BTDB2 last updated|4.13|section=y}}
+Sentry Expert is effective at acting reactively against Bloon rushes and early MOAB rushes, making it stand out between rounds 11-19. The specialized sentries are often enough to take down most rushes after the initial burst of sentry production, and Sentry Expert stabilizes with a full army of normally produced sentries by the end of the burst. However, against round 11, it can be a significant money investment for Engineer-based defenses to buy Sentry Expert for that round, due to needing to buy it and camo detection to compensate for the latter weakness.
+-0-1 and 4-0-2 are generally preferred for the pierce bonus, as these upgrades allow the Sentry Expert to take down rushes more reliably.
 ==Update history==