Implement the Blast status effect.

[givikuna]

Implement the Blast status effect.

Here is the necessary information:
| Blast | 30% base damage after 2 turns per proc; special explosion rules | Max 10 (recommended) | 2 turns per proc | At 10 stacks: each blast proc explodes for 300% base damage. On death: remaining procs explode for 50% base damage. Explosion is AOE at the location. |