Duration reduced to 1 turn/level. Assuming a form heals 2 hit points/level instead of granting temporary hit points. Troll regeneration reduced to +1 only. Additional options available – see separate section. Cancel your polymorph before you log out or you could log back in with a character who walks at monk speed.
The Narfell implementation changes the BioWare implementation so that the duration is 1 turn per caster level. Further changes to this spell have ensured that the troll regeneration was lowered to 1.
Mages, Rangers, and Animal Domain Clerics can polymorph into additional shapes over the default Bioware ones.
In order for a mage to polymorph into other shapes, he needs to have a special reagent that contains the part of the life force of what he wishes to become. The procedure for polymorph is:
Most reagents have limited charges, though permanently charged reagents are possible. Some extremely powerful shapes may also have minimum level requirements. If there is a failure to use the new form, the standard scripted shape for that Radial slot will be used instead so that the spell is not wasted.
Shapes are NOT stored like they are with druids' Wildshape feat.
DMs can add more reagents at their discretion, which can be permanent or have charges, and can have level limits placed on them.
Clerics with the Animal Domain also have access to Polymorph Self. However, unlike mages and sorcerers, they do not use reagants, but living animals. To learn a shape, you must control the animal. This means a successful Animal Empathy or Charm Animal/Monster. For this purpose, animal domain clerics were given the charm animal spell. Hostile actions (and hold spells) by any party member will break this. You also need to be the correct level.
For the most part, small to medium animals, including ordinary wolves, become available at Level 5. Large animals, like bears become available at level 8. Dire animals and magical beasts become available at Level 12.
Subsequent castings of the spell will use the stored animal shape as long as you target yourself with the spell. If you target nothing, the standard scripted shape will be used instead.