warlock

2 Warlock: Whenever a Warlock casts a spell, they form a link with the Ally who has the lowest health percentage for 3 seconds. When either linked hero deals damage, both units are healed 50% of the damage dealt.
4 Warlock: Whenever a Warlock casts a spell, they form a link with the Ally who has the lowest health percentage for 3 seconds. When either linked hero deals damage, both units are healed 80% of the damage dealt.
6 Warlock: Whenever a Warlock casts a spell, they form a link with the Ally who has the lowest health percentage for 3 seconds. When either linked hero deals damage, both units are healed 130% of the damage dealt.