Megamorph Tier 5 Spell Costs 0 Focus You can only activate this ability when either you or a teammate has less life than the enemy. (It can only be activated 10 turns in)
Edit: Invisibility Tier 1/2/3 Spell Costs 10/15/25 Focus(CD:6/7/8) Makes you invisible. The enemy can still hit you, but your speed goes up 120%/220%/320%