Form

Forms are Dervish-only skills that temporarily transform the user into an avatar or representation of one of the Gods. Forms alter a player's physical appearance, as well as provide powerful positive benefits. Forms have very quick recharge times, but if the player succeeds in activating a form, the skill will be disabled for an additional 2 minutes.

When a form ends, you are interrupted. This is a hard interrupt that cannot be avoided with Mantra of Resolve or Glyph of Concentration.

While in the form shape, the player's character will have alternate emotes.

Skills
Form skills cannot be copied using Arcane Mimicry. This is presumably because of their extremely extended duration that can be used to keep the Form up at all times using the spell.

For a list of Form skills, see Category:Forms.