Overview
| Field | Value |
|---|---|
| Name | Pressure Valve (圧力弁) |
| Type | Base Passive |
| Tier | S |
| Effect | Enemies explode on death, dealing 20-30 damage to adjacent enemies |
Evaluation
A standout S-tier passive for clearing groups. When an enemy dies, it explodes and deals damage to adjacent enemies — if those enemies die from the explosion, they also explode, triggering a chain reaction that can wipe entire waves.
The passive scales exponentially with enemy density. In mid-to-late wave situations where enemies pack together, a single kill can cascade into a full-board clear. Less effective against bosses (explosions don't apply to bosses), so keep that context in mind when building.
Against regular waves, Pressure Valve is among the most powerful passives in the game.
Synergies
Ball Synergies
| Ball | Rating | Reason |
|---|---|---|
| Bleed | ★★★ | Bleed damage bleeds multiple enemies to near-death, setting up chain explosions |
| Poison | ★★★ | Poison DoT kills multiple enemies simultaneously, triggering chain blasts |
| Ghost | ★★★ | Pierces all enemies in a line, accumulating kills for chain explosions |
| Bomb | ★★★ | Explosion + Pressure Valve explosion double-clears the field |
| Freeze | ★★☆ | Focus frozen enemies to burst-kill and start the chain |
Passive Synergies
| Passive | Rating | Reason |
|---|---|---|
| Ethereal Cloak | ★★★ | Multi-kill through piercing keeps chains going constantly |
| Dynamite | ★★★ | Explosive enemies interacting creates a snowball of blast damage |
| Magic Staff | ★★☆ | AOE damage boost amplifies the explosion damage |
| Midnight Oil | ★★☆ | Burn DoT kills create a steady stream of chain explosions |
Recommended Characters
| Character | Priority | Reason |
|---|---|---|
| Warrior | ★★★ | Covers weak group-clear with pure explosion output |
| Empty Nester | ★★★ | Multiple fire lines create consistent multi-kills for chains |
| Physicist | ★★★ | Fast fire rate triggers first kills quickly to start chains |
| Radical | ★★☆ | Mix it up in the wave while maintaining explosion chains |
| Ascetic | ★★☆ | High per-ball kill power reliably starts explosion chains |
Pickup Priority
Always prioritize in enemy-dense stages. Against packed waves, this passive alone can decide games. Slightly lower priority in pure boss-focused builds, but remains strong even then.