Inject your target with a virulent poison that does immediate damage, but also has a lingering effect. Anyone damaged this way is injected with a Poison with a lethality equal to your Action Value.
Common Metablasts
Aim, Animate, Area-Autofire, Area-Ball, Area-Cylinder, Area-Cone, Armor Piercing, Curse, Drain, Focus (depending on source), Homing, Lingering, Melee, Paralysis, Ranging, Sleep, Slime, Stun.