[MegaBlues]

For refreshing once every turn for five turns, assuming you guard one attack from one target that's attacking you twice, that's equivalent to a 25% DR, but it can be bypassed or devalued with multihits or being hit by multiple targets, so that could actually work.

However, I could also see it being reduced to 1m with a 3-turn cooldown (or less, or none, even) to be made into a momentum burner to make use of that 1m Evoker can't spend itself.

It could even be turned into a main class passive that, if you end your turn with 1m or more, automatically reactivates your tattoos.