greater polymorph
Class: mage : 9
Syntax: cast CLASS greater polymorph on TARGET | dragon/demon/golem

With this spell you transform yourself or a party member into one of several fearsome creatures. In the new form you won't be able to access your inventory, but you will possess mighty melee abilities. The potency of the form will grow with your power, but it won't benefit from transformation spell. In addition winged forms can use <wing> command to travel. You may only maintain one polymorph at any given time. You cannot polymorph constructs or golems).

N.B. You can set alternative description, speech string and adjective for these forms.