Psi's basic attack inflicts psionic vibrations on the target, which freezes it in place, then instantly destroys the entire Bloon after a short delay that depends on the strength of the target. They can attack Bloons anywhere on the map, even through line of sight blockers, and are always able to see Camo Bloons, but they cannot target Lead, Purple, Ceramic, or MOAB-Class Bloons initially. As they level up, their psionic vibrations destroy Bloons faster, they gain the ability to target more Bloon types, their psionic vibrations gain additional effects, and they gain Activated Abilities that inhibit Bloon movement.
Starting at level 4, their attack can affect multiple Bloons near the target.
Starting at level 8, their psionic vibrations damage other Bloons near the target when it pops.
At levels 9 and 17, they gain a copy of their attack with different targeting, allowing them to target multiple Bloons at a time.
Psi has two Activated Abilities:
Psychic Blast (level 3) — Emits a shockwave around Psi that stuns Bloons for a short time. At higher levels, this spawns multiple shockwaves with a short delay in between.
Psionic Scream (level 10) — Inflicts half of all the Bloons on-screen with psionic vibrations, and the other half with blowback, at random. Level 20 guarantees psionic vibrations.
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Psionic vibrations
Psi's main attack places psionic vibrations on the target. This attack has infinite range, can target through line of sight blockers, and can target Camo Bloons. When a Bloon is inflicted with psionic vibrations, it freezes in place and becomes untargetable by all towers for a short time, then is instantly destroyed, leaving no children. This attack has an attack cooldown of 1 second, but it does not start until after the psionic vibrations have destroyed the target.
Psionic vibrations are similar to damage over time in that they apply "damage" according to a "tick rate", but instead of dealing the damage on each tick, the effect counts the damage it would have dealt, then instantly destroys the Bloon once it would have taken enough damage to be fully popped from the total damage. In other words, the time it takes for psionic vibrations to destroy a Bloon is based on the Bloon's combined health of each layer, the "tick rate" at Psi's current level, and the "damage" it would deal at Psi's current level. By default, it deals the equivalent of 1 damage per 0.2 seconds. It also destroys the target instantly after 15 seconds, or 3 seconds if it is the final Bloon in a round (to prevent stalling). This can be expressed with the following formula:
"Tick rate" reduces from 0.2 seconds to 0.15 seconds, effectively reducing the time it takes to destroy a Bloon with psionic vibrations by 25%.
4
Each attack creates a small "splash" projectile with 1 pierce and a radius of 6 units centered on the target, which inflicts psionic vibrations on Bloons it hits. This splash can only hit Bloons the main attack can target, except MOAB-Class Bloons, which it cannot hit at all. It is affected by pierce buffs.
5
Attack cooldown reduces from 1 second to 0.85 seconds, effectively increasing attack speed by roughly 17.6%, without affecting the time it takes for psionic vibrations to destroy Bloons.
6
Can now target Lead Bloons without buffs.
7
Can now target Ceramic Bloons. Splash pierce increases to 2.
"Tick rate" reduces to 0.1 seconds, effectively reducing the time it takes to destroy a Bloon by 33%. Splash pierce increases to 3.
14
Can now target MOABs. "Damage per tick" increases from 1 to 4, effectively reducing the time it takes to destroy a Bloon by 75%. Starting at this level, Super Ceramic Bloons take half as much "damage per tick".
16
Can now target BFBs. Tick rate reduces to 0.075 seconds, effectively reducing the time it takes to destroy a Bloon by 25%.
17
Gains a second Split the Mind.
18
Splash pierce increases to 5. Splash radius increases to 15 units.
Starting at level 8, psionic vibrations create a small explosion called Destructive Resonance after popping a Bloon. It deals 1 damage, has 10 pierce, and can hit any Bloon type (including Bloons that Psi cannot target), but cannot damage Purple Bloons.
Levels
Level
Effect
11
Now damages Purple Bloons.
15
Damage increases to 3.
19
Damage increases to 10.
Split the Mind
Starting at level 9, Psi gains a copy of their psionic vibrations attack that has the exact same properties, except it does not follow Psi's targeting. It has Elite targeting, but its First targeting triggers when a Bloon reaches 50% of the track length instead of 75%. At level 17, Psi gains a third copy of the attack that always targets First, but prioritizes MOABs and Ceramic Bloons.
Abilities
Psychic Blast
Psychic Blast unlocks at level 3. It triggers a blast that stuns one layer of up to 200 Bloons within 60 units of Psi when activated. The stun lasts for 6 seconds for non-MOAB-Class Bloons and 1.5 seconds for MOAB-Class Bloons. It does not affect BADs or Boss Bloons. It has a 40-second cooldown.
Levels
Level
Effect
7
Triggers a second blast 2 seconds after the first (unaffected by attack speed buffs).
12
Triggers a third blast 2 seconds after the second (unaffected by attack speed buffs).
Psionic Scream
Psionic Scream unlocks at level 10. It targets up to 2,000 Bloons on-screen, prioritizing the Bloons closest to Psi. Each Bloon targeted has a 50% chance to be afflicted with psionic vibrations (with the same properties and Destructive Resonance as Psi's main attack at their current level, but without the splash projectile) or a 50% chance of being blown back by 100–250 units. It only targets Bloons that Psi's main attack can target. It has a 60-second cooldown.
At level 20, Psionic Scream always inflicts psionic vibrations.
Levels
Level
Description
1
Over any range or obstacle, Psi sets up deadly vibrations that completely destroy one Bloon at a time. Can target Camo.
2
The psionic vibrations destroy Bloons faster than normal.
3
Psychic Blast: Psi unleashes a wave of power that stuns nearby Bloons for a long time.
4
Psi's attack can hit another Bloon if very close to the targeted Bloon.
5
Attacks slightly faster.
6
Psi's powerful mind can penetrate through Lead Bloons.
7
Psychic Blast pulses twice. Psi can now destroy Ceramic Bloons.
8
Destructive Resonance causes Bloons destroyed by Psi's main attack to damage other Bloons nearby.
9
Split the Mind. Psi can now target two different Bloons at once.
10
Psionic Scream: Psi unleashes a silent scream that throws the Bloons into utter chaos.
11
Not even Purple Bloons can resist the power of Psi's mind attacks.
12
Psychic Blast pulses three times.
13
The psionic vibrations destroy Bloons even faster.
14
Psi's immense psychic power allows targeting and destruction of MOABs.
15
Destructive Resonance is more destructive.
16
The psionic vibrations destroy Bloons very fast. Psi can now target BFBs.
17
Split the Mind. Psi can now target three different Bloons at once.
18
Psi's attacks affect Bloons within a larger radius of the target Bloon.
19
Destructive Resonance is much much more destructive.
20
Psionic Scream holds and damages all Bloons on screen. Psi can now target DDTs and ZOMGs.
XP requirements
Note: the number of rounds to level up assumes the Hero is placed on round 1 and no other Heroes are placed.
Psi excels on Advanced and above maps, due to their higher value from leveling up faster, and their favored game mode is CHIMPS. Psi has no trouble on obstacle-heavy maps and can attack anywhere, but placement is still important for the Psychic Blast ability (try a Monkey Buccaneer to roughly measure the ability's radius). During mid-game, Psi excels at eliminating 3 of 4 Ceramic children from MOABs (requires level 7), and reducing RBE from rounds, including dense rounds (level 10). They get significantly stronger once they're able to instakill MOABs and BFBs (levels 14 and 16, respectively). Their DDT and ZOMG instakills at level 20 are powerful, however requires Energizer to feasibly obtain this level naturally.
Update history
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Psi’s Psionic Scream often didn’t feel as satisfying if a lot of the blown back targets rolled a minimum distance, so we have upped the minimum distance that it can blow back — Update notes
We felt that Psi’s early game too easily carried into some extremely powerful endgame setups. These setups were overperforming due to certain cooldown interactions with stalling out cooldown, however in an effort to try to avoid nerfing the cooldown for the average player we decided to make that stalling synergy harder to pull off instead. — Update notes
”
Levels
Changes
All
Placement cost increased ― $800 → $1,000
10+
Psionic Scream ability 'speed of blow back' increased from bloon speed increased ― 300% → 600%
Note: May reduce stalling potential, but also may allow targets to reach towers sooner
Psi felt too easily able to keep up with early waves given their strong endgame, and given the improved attack rate was then unchanged from level 2 to 20, we have shuffled around the Lv2 and Lv5 upgrades to address this. Psi from Lv5 onwards is unchanged from before. — Update notes
”
Levels
Changes
2–4
Lv2 No longer increases attack speed ― 0.85s → 1s
Now increases Bloon destruction rate ― 0.2s per layer → 0.15s per layer
Psi’s stalling out of the end of round is an odd mix of useful / annoying / out of control, so we are for now capping this to a 3 seconds of overtime stalling. Psi’s Psychic Blast ability also has weirdly low pierce for a long cooldown ability with no damage, we are increasing the base pierce greatly but it no longer increases in pierce at Lv7 since the extra pulse brings more pierce anyway. — Update notes
”
Levels
Changes
All
If no Bloons are left unpopped on screen aside from ones Psi is currently holding & destroying, these Bloons will be destroyed after a maximum of 3 seconds
Note: Big nerf for strategies that involve stalling
To give Psi’s Lv10 more breathing room we’ve moved some of the max blowback distance down into the minimum so it stays the same on average, but now with more time before the first Bloons start to get back to the track and reach your defense again. — Update notes
”
Levels
Changes
10–19
Psionic Scream: blowback min distance increased ― 50 → 100
Psionic Scream: blowback max distance reduced ― 300 → 250
Psi should be quite strong given their position in the game, but is performing a little too well so we are slightly reducing their Lv3 ability cooldown rate. — Update notes
Hero Favors:
1-0-0 Ninja Monkey
0-2-0 Desperado
5,000 starting at level 35.
![[[Psimbals|Psimbals]]](/images/thumb/6/61/BTD6_PsimbalsPortrait.png/59px-BTD6_PsimbalsPortrait.png)
![[[Dreamstate Psi|Dreamstate Psi]]](/images/thumb/f/f3/BTD6_PsiDreamstatePortrait.png/84px-BTD6_PsiDreamstatePortrait.png)
![[[Qīnglóng Xiūshì Língjī|青龙修士灵机 (Azure Dragon Monk Psi)]]](/images/thumb/1/13/BTD6XD_Psi_NewYearPortrait.png/73px-BTD6XD_Psi_NewYearPortrait.png)
Psi Bison Pet
110, Pets Fan Pack (IAP)
Levels 1–2
Levels 3–7
Level 8
Level 9
Levels 10–16
Levels 17–19
Level 20
Round icon
Square icon
Psychic Blast icon
Psionic Scream icon
