Necrosis

 is an active ability, which means it will only activate once the creature has a full bloodlust counter.  For a list of all Cards with this ability, click here! 

Variations
always activates during the card's turn. On cards other than creatures and weapons it may only have a chance to activate. Creatures with this ability will always target the opposing enemy, or sometimes all enemy creatures, other cards target any one enemy or all enemies.

Strategy
Use this in ability in unison with Exectute and Earthbind to spell any enemies' doom!