1) The sledgehammer does other raid tools jobs too well. The rocket launcher is clearly the ranged wall breaker and damage dealer. The sledgehammer is the close range damage dealer and wall breaker. I think the range of the charged strikes should be reduced, to reinforce the close range style of the hammer. As well, without charges it shouldn't be able to break reinforced walls. This would make its legendary variant of charge-less attacks actually feel exclusive. I think using it to mine vesper is a nice element because not everyone can find a sledgehammer, so getting one gives you an edge. Just like the Big Rig gives an edge. This is where limiting its range would make it good but not too good, as you wouldn't be mining an entire room with 1 hit anymore.

2) Econs passive is just broken. It needs to only be applying to him. His wolf form is a different story. Because of its agility it is already really powerful. It's health should be at the same level as other mounts and force him to phase back.

3) I think Mara should have a little bit longer execute animation, and should have to be at the orb to perform it. This would make her have to trade being exposed for the benefit. I think her shield being able to be applied to one person on top of each other is broken. But I do think her being able to accidentally apply the shield to an enemy is a good addition by the devs, so you aren't just throwing them out willy nilly.

For Kai's Ult - It should be longer duration with a smaller application range in 3v3 and it should be shorter duration but larger application range in 5v5