Alter Fate

From HammerWiki

Alter Fate Buff Core Ability Support careers Rank 4 Morale No range Instant cast 60s cooldown Resurrects all groupmates within 30 feet. Anyone who is brought back from the dead will also be healed for X over 5 seconds, and they will deal 20% more damage for 10 seconds.

This ability can be used during certain boss-fights, where resurrection is otherwise impossible, as you do not need to target the dead ally.

Note, this will be changed after the 1.2 patch and will have limited use.

However, this apparently does not work during fortress sieges while the enemy lord is engaged.