What if Sheltron was...a GCD ?

[Reynhart]

I like the idea of being able to block at will but the off gcd part of it means you lose no damage.

Being off GCD means having a cooldown, which Sheltron already has, and a short one at that.
The idea is to allow 100% uptime 100% blockrate. In the long run, it would be a huge mitigation, so the GCD part is kind of a tradeoff.

What it would need is a modifier proc for an attack coming up. Maybe the next shield Swipe procced by a successful Sheltron does double or even triple damage.

What could be interesting is to give an effect where after a succesful block with Sheltron, your next weapon skill ignores the damage penalty of Shield Oath (A "counter" buff).
So, by going back and forth between one Sheltron, one WS, one Sheltron, one WS, etc...you wouldn't lose that much damage.