|Title(s)||The Defender, the Vigilant Guardian, the Wary Sword|
|Home plane||Seven Mounting Heavens of Celestia|
|Portfolio||Protection, vigilance, war|
|Domains||Good, Law, Protection, War (also Halfling in Forgotten Realms)|
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 lives in the halfling realm of the Green Fields on the plane of Mount Celestia.
Arvoreen's clerics wear silver chainmail and helmets. His sacred animal is the war dog.
Arvoreen is worshipped before battle. Silvered weapons are typically sacrificed to him when followers seek his blessing.
In other media
- Moore, Roger E. "The Halfling Point of View." Dragon #59 (TSR, March 1982)
- Gygax, Gary (December 1984). "From the Sorcerer's Scroll: Clerics live by other rules". Dragon (Lake Geneva WI: TSR) (92): 22.]
- Gygax, Gary. Unearthed Arcana (TSR, 1985)
- Sargent, Carl. Monster Mythology (TSR, 1992)
- Niles, Douglas. The Complete Book of Gnomes & Halflings. Lake Geneva, WI: TSR, 1993
- McComb, Colin. On Hallowed Ground (TSR, 1996)
- Boyd, Eric L. Demihuman Deities (TSR, 1998)
- Perkins, Christopher. Warriors of Heaven (TSR, 1999)
- Boyd, Eric L, and Erik Mona. Faiths and Pantheons (Wizards of the Coast, 2002).
- Williams, Skip. Races of the Wild, Renton, WA: Wizards of the Coast, 2005
- Conforti, Steven, ed. Living Greyhawk Official Listing of Deities for Use in the Campaign, version 2.0. Renton, WA: Wizards of the Coast, 2005. Available online: 
- Dragon magazine #171 - "Defenders of the Hearth"
- Living Greyhawk Journal no. 3 - "Gods of Oerth"