Book of Vile Darkness wrote:
Devil's Tail
Transmutation [Evil]
Level: 1
Components: V, S
Casting Time: 1 action
Range: Personal
Target: Caster
Duration: 1 minute/level
The caster grows a three-foot-long tail. The tail is thin, black or red, and it ends in a spike. The caster can use this tail to make melee attacks using his attack bonus, dealing a base 1d4 points of damage, plus one half his Strength bonus. If the caster takes a full attack action, he can use both the tail and his normal melee attacks, but all attacks have a -2 penalty.
Converted to the mud, it would give the target an additional "tail" attack in melee combat for its duration as well as look really really cool.