Demon Form
Demon Form (Transmutations : 9) You turn into one of the sentinels of hell; your body armour is replaced with their metallic garb. Melds your body armour (that's it, all other equipment is fine). Grants Archmage, Spines, rTorm, rN+++, rElec, rF+, rC+, rPois+. Grants Demonic Spellcasting {You may cast any spell EXCEPT silence while silenced.} AC=Transmutations skill/2. Also grants a slaying bonus (to everything) of +[Transmutations/3] Duration is short compared to other transmutations unless your spellpower is high (which is rather impossible for a level 9 spell in a school where no enhancers are available.)
In short; you gain all the bonuses of being a demon, except rHellfire. Your body armour is melded, but you receive many resistances and up to 13 points of AC.