So after playing around with conversion though most of the Demon Prison area and realizing that for some reason (probably intentional) a lot of the mobs there do not receive the ‘debuff’ icon when it is cast on them. Probably to add insult to injury the debuff does seem to show up on the non convertible elite mobs. This lead to thinking about some of the major issues with this skill and how it can be fixed.
Major Issue
The main problem with Conversion is the buggy AI and how it interacts in dungeons that have a kill requirement to progress. Things like disappearing mobs and such can be dealt with via just waiting for the CD and converting more.
Solution
The easiest solution, while a bit lazy, is to make the skill function like the Bokor’s Zombify skill. Make the conversion chance proc on a monsters death, if the enemy is converted then spawn a spirit version of the mob as an ally (think blue and semi transparent) shortly after the mobs death. This will prevent already converted mobs AI from breaking due to its target being converted while its attacking them and prevent converted mobs from mucking up kill requirements for dungeons hopefully making it more team friendly. As a bonus the mobs will be blue and semi transparent so being able to differentiate between them and regular enemies will be easier for teams/grinding groups.