Now back to smelly army... Ke'Sha doesn't mind. He is resistant to such mundane affairs of LIVING creatures

Regarding disobedient intelligent undead, Ke'Sha doesn't mind. He is resistant to such mundane affairs of LIVING creatures

Just kidding. Ke'Sha trusts himself to be able to deal with them, or flee fast enough to leave the problem behind him. But hey, we are a group of 15-17 lvl characters, we should easily deal with few ghasts, wraights, vampires and even liches (if they come one at a time) I believe. And besides, Ke'Sha has the chance to get total control over some and he is useful for THEIR patron, creating more and more undead, so they better co-operate. (They also get good deal, having dominant over new undead, dungeons and treasure once Ke'Sha leaves, and they have strong ally if they need something, and one to work on researching spells, creating new undead, etc etc).
There are spells to heal undead. I think there is undead regeneration. Also Dark something of Bashabshka... But for weak undead like zombies and skeletons, it is just easier to raise them again. Any undead creature that can't survive three attacks shouldn't bother Ke'Sha with heal in my opinion.