[@Cleverbird] Okay... so no, that's not acceptable. On a fundamental level sentient undead are made pretty much [i]immediately[/i] and often starting with a living person because they just don't work given time to decay and the soul to completely leave the building; consequently aside from being pale and generally quite chilly (though with magic involved they can work on those) there's no sign of undeath, no glowing eyes. You could maybe, [i]maybe[/i] get a grey pallor and major injuries stitched up but any later and... it won't work. You have a monster.

The other thing that can't be accepted is, honestly, just how overly edgy it is. A berserker that could easily start being a teamkilling asshole at any time, the whole "tear you limb from limb and run off and brood for sixty years"... and, sorry, that image. Not only is it spiky and ridiculous, but it's kind of unacceptable to have an undead character wandering around carrying [i]people's skulls.[/i] This isn't Warhammer 40k.