A bit of help with modded Deirex, please?

Hi folks,
I'm in Ust Natha, and trying to deal with Deired the lich, who is seriously modded (SCS). It appears my party is genuinely too inexperienced for this fight at the moment: I cannot bring down his Spell Trap and other defenses, and thus I cannot deal a single point of damage. Also, he summons that Fallen Planetar that absolutely tears me to shreds. Switching to Easy Difficulty doesn't help.
So, ahem, what would be the console command to just kill him? I'm willing to resort to that, I'm afraid. Unless someone can suggest a strategy...
Incidentally: what is the component that allows liches to summon those Planetars? It's seriously nasty, and I'll probably tone it down. Irenicus also summoned one in Spellhold, and I had to resort to running away and waiting for the Planetar to be unsummoned. With Deirex, this is not possible, the space is too small.
I'm in Ust Natha, and trying to deal with Deired the lich, who is seriously modded (SCS). It appears my party is genuinely too inexperienced for this fight at the moment: I cannot bring down his Spell Trap and other defenses, and thus I cannot deal a single point of damage. Also, he summons that Fallen Planetar that absolutely tears me to shreds. Switching to Easy Difficulty doesn't help.
So, ahem, what would be the console command to just kill him? I'm willing to resort to that, I'm afraid. Unless someone can suggest a strategy...
Incidentally: what is the component that allows liches to summon those Planetars? It's seriously nasty, and I'll probably tone it down. Irenicus also summoned one in Spellhold, and I had to resort to running away and waiting for the Planetar to be unsummoned. With Deirex, this is not possible, the space is too small.
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Comments
SCS' "add HLAs to high level spellcasters" component is presumably the cause of the planetar summoning.