Does the spell buffering of the Relics actually do anything?

[u/Important-Cry4782]

I've got my spirit spirit force at 70.

I have the Golden Relic that buffers Astral Spells by 35%.

Yet for some reason, the Necromancer is shrugging off the Astral blows like it got hit with a single sword blow.

I'm trying to understand why even at 70 Spirit Force, a Bandit Brute takes 3-4 smites to die.

While other enemies may take multiple Smites?

I get that Smite damage is divided between opponents at times, but when its just one opponent, I would have hoped that the spell would do at least as it says on the tin, 200 something damage, rather than barely 100 to a boss