In many campaign settings for the Dungeons & Dragons fantasy role-playing game, the halfling pantheon of gods consists of the leader, Yondalla, as well as Arvoreen, Brandobaris, Cyrrollalee, Sheela Peryroyl, and Urogalan.
Arvoreen is the halfling deity of protection, vigilance, and war. He is also known as "The Defender." Arvoreen lives in the halfling realm of the Green Fields on the plane of Mount Celestia.
Arvoreen was first detailed in Roger E. Moore's article "The Halfling Point of View," in Dragon #59 (TSR, 1982). In Dragon #92 (December 1984), Gary Gygax indicated this as one of the deities legal for the Greyhawk setting. He also appeared in the original Unearthed Arcana (1985).
Arvoreen was detailed in the book Monster Mythology (1992), including details about his priesthood. The deity's role among his followers was expanded in The Complete Book of Gnomes & Halflings (1993). His role in the cosmology of the Planescape campaign setting was described in On Hallowed Ground (1996). He received a very detailed description for his role in the Forgotten Realms in Demihuman Deities (1998). He is described as one of the good deities that celestials can serve in the supplement Warriors of Heaven (1999).
Arvoreen's role in the Forgotten Realms is revisited in Faiths and Pantheons (2002). He was detailed again in Races of the Wild (2005).