Serpents Tongue

Warlock Invocation
Level: Least, 2nd lv.
Components: V, S
Casting Time: 1 standard action
Range: Self
Duration: 24 hours
Saving Throw: None
Spell Resistance: No

Your tongue transforms into that of a serpent, and you gain the scent ability (MM 314). Additionally, you gain a +5 bonus on saves against poison. This invocation lasts for 24 hours.

(Complete Arcane, Page 134)