Talk about age old rivals. Maxwell (the elf on the right) and Verese Pentaloth (the human on the left) studied at an Elven magic university over 800 years ago together. They remained good friends until Verese decided to unnaturally extend his life into lichdom. While Verese isn't exactly your classic evil lich (he's actually quite friendly), Maxwell had him sealed off in a cave for a good long time. They let him out for a while to help stop really bad stuff to happen but locked him away again when his use was over. Pentaloth, being a nice guy went along with this for a while but eventually got bored and left his confinement. He doesn't like Maxwell anylonger.
these guys are classic NPCs to Ae'rinus, and have been featured in many drawings. This one is the most recent. I have a nice color one of them, but it's on 20x30 illustration board. Oh well.