Beast Spirit of Fire
The Beast Spirit of Fire (火のビーストスピリット Hi no Bīsuto Supiritto) was created from Ancient Greymon of the Warrior Ten. It was hidden in Shamamon's Temple. While the Legendary Chosen were fighting Gigasmon the spirit reveals itself (possibly because of Gigasmon's Earthquake attack). Shamamon takes it and unwillingly spirit evolves into Vritramon. After Vritramon was beaten by Takuya he scans it and becomes Vritramon also. Takuya has a difficult time at first but later gains full control of this spirit.
(Note: Is called Spirit of Flame B in the TCG.)