a love of ridiculous drama, a penchant for overcomplicated schemes, and a strong tendency to frequently disappear to conduct secretive ‘archmage business’
Lying in order to craft a Necromantic Power Potion is certainly a bad sign, but still compatible with him being some other dark wizard type rather than the “Loathsome Lich” in particular.
Regarding your proposal in second comment: even if he is undead he might not need to drink it to tell what it is. Still, could be worth a shot! (now three different potion types to figure out how to make...)
Maybe...
a love of ridiculous drama, a penchant for overcomplicated schemes, and a strong tendency to frequently disappear to conduct secretive ‘archmage business’
Lying in order to craft a Necromantic Power Potion is certainly a bad sign, but still compatible with him being some other dark wizard type rather than the “Loathsome Lich” in particular.
Regarding your proposal in second comment: even if he is undead he might not need to drink it to tell what it is. Still, could be worth a shot! (now three different potion types to figure out how to make...)