Originally Posted by
Aucald
I'm not saying he doesn't deserve it, I just think the heel realization of regaining his soul and/or humanity moments before his death sounds like an even worse punishment. YMMV, of course.
That is pmuch what happened to Sylvanas. Her soul became whole when she jumped off ICC, only to feel it suffer.
And then she felt—truly felt, for the first time in a long while. She recoiled. In agony.
Here she was, her spirit once again feeling whole, only to feel it suffer. To feel once more, only to feel abject pain. Cold. Hopelessness.
--Edge of Night
Arthas didn't seem at that point of agony yet while on the floor of ICC, but he probably had a version of it before dying. Losing a soul or having it fractured seems to dull one's emotional spectrum (similar to necromantic resurrection).