After the fight, I went to the defeated Tartarus monsters and tried to get their skills. But it seems that by being undead I can't use it on them.
It's the same when I fought the vampire and the others back at Burliande.
It's a shame because that Lich had some great powers. Infinite Mana, great healing capabilities, increased mana regeneration, stringer defense spells perfect for healing.
We all went back to Izgoy and I'm looking at the reports Velyn made for me. She's diligent and there's reports for everything going on in the kingdom. Farm, training grounds, hunters and so on.