Wiktionary
star vault
n. (context architecture English) A vault whose ribs radiate to form patterns reminiscent of stars
Wikipedia
Star Vault
Star Vault (2010-2016) is a Swedish games company founded by its CEO Henrik Nyström.
Star Vault is the creator of Mortal Online, a first-person fantasy MMORPG using Unreal Engine 3. Mortal Online launched June 9, 2010.