Price 23,315 gp; Slot none; CL 7th Weight 6 lbs.; Aura moderate conjuration
It functions as a +2 longsword.
Three times per day, when the wielder confirms a critical hit with a sword of tempests, as an immediate action he can will a fraction of the blade to break off and transform into a Medium air elemental (this does not affect the sword itself). The elemental fights as the wielder directs for 7 rounds, or until it is destroyed. At the GM’s discretion, similar weapons may exist that summon elementals from different planes.
Pathfinder Player Companion: Monster Summoner’s Handbook © 2015, Paizo Inc.; Authors: Alexander Augunas, Tyler Beck, Anthony Li, Luis Loza, David N. Ross, Owen K.C. Stephens, and Linda Zayas-Palmer.