Beast Spirit of Light
The Beast Spirit of Light (光のビーストスピリット Hikari no Biisuto Supiritto) was created from Ancient Garurumon of the Warrior Ten. It was found underground. It's location was pointed by "guardian" statues which when three rubies were placed in their eyes would point out the location. Minamoto Kouji along with help from Gotsumon put them in place and Kouji got this spirit allowing him to spirit evolve into Garmmon.
(Note: Is called Spirit of Light B in the TCG.)