It's a raw heal that will likely be your most-used ability. Holy Light This is Uther's primary healing spell.
He does have a few abilities that damage enemies, but your role is to keep your teammates alive for as long as possible, and Uther is good at doing that. As a Support class Uther won’t dish out a ton of damage, but that's fine. However, what he lacks in crowd control he makes up for in raw heals and the occasional stun. Uther doesn't have the crowd control that someone like Malfurion possesses.
OK, so that's not really the case, but if you're going to play Uther you need to embrace his personality, right? Uther is one of the Support class heroes in Heroes of the Storm, but like many of the heroes in the Support class, how you play this character is different from how you play the other heroes. Justice demands that you play Uther if you're looking for a Support class in Heroes of the Storm.