"Time Thief" sounds more literary...
"Limitless Traveler" is already better, but it still sounds a bit rough...
"Sandro the Digger" was a killer :D he's not a rat-catcher, is he?) Unless I understand correctly, and this is about a Necromancer...
"Master of Fear" is also not very good, "Lord of Fear" would be better, or at least "Ruler of Fear"
and what does "Light Necromancer" mean? Is it like in the topic about "white" chocolate? Maybe "white necromancer" would be better, since you decided to add some lyricism...
"tireless trainer" - what is that?)) Maybe "training commander" would be better?
"Rich Champion" - doesn't sound good.
2. Well, I just wrote what came to mind
3. Then you can use "grave loosener"
4. I don't know
5. Light Necromancer? It's a Necromancer who specializes in light. And by the way, white chocolate also exists ;)
6. Tireless trainer - a trainer who is not too lazy to train anywhere :)