Ok I don't know what this is, but this is my description of whats happening right now.
Im level (random #) and Im just derping around killing Ash Spawn, no problem, like a tank. Then all of the sudden, a few levels later Im fighting Ash Spawn again. Except this time, one of them hits me with a firebolt and nearly a QUARTER of my health already gets chunked out. My max health is 230 so its not like I have a low health bar or anything. This kind of seems like a bug to me, so I decided why not ask about.
(Addition: Im currently wearing Blades Armor at the moment)