but what would eph use :(
Maybe instead of a one time use they could only use it when they have 100% hp, since you take damage from the shockwave ?
I dont know if this would be a good idea/possible , but how about giving certain classes boots like the gunboats. Except instead of reducing self damage, they halve fall damage, at the cost of "reduced armor". Players will take 1.2-1.5x more damage from all physical damage excluding falling.
The only problem I see here is that its probably an issue for ephi/badspot users.