Game Mechanics: "a mummy" (LFay) unhittable?

[Risce]

Hello,

I'm a level 12 paladin with maxed Offense and One Hand Slashing skill. I normally can solo blues. However, the blue "a mummy" found in LFay at the center of the undead shrine (approx +0, +2300) was unhittable for me. I stood toe-to-toe with this mob and missed every single swing and bash. I am not exaggerating. I could not hit this mob even once for a single damage point.

I fought it twice. The first time I used LoH near low health, so maybe count that as 3 fights. The second time I feared it when I was 20% and ran to MM zoneline. I'd estimate about 80-150 attempts (swings and bashes) and 0 hits.

Something's gotta be going on here.