I think that instead of reducing It's chance reduce the time it last and make it so it can only happen 10 seconds after last shield have been tiggered.
In other words, do you mean this should have a cooldown? That I can do easily. Like this can happen maximum once per 10 seconds.
Hmm. You indeed have a point, pl4ton. Or I could make like a basic Divine Shield. When player presses the ability Fradz becomes invulnerable like for 1 sec, and this has 15 sec cooldown. This way it's easy for player to change enemies attack target from Fradz to someone else.
This is still just speculation. What do you think?