This colossal warrior can be found in the depths of the Pyramid and is summoned by using Pyramid Ruby on the plaque within his chambers where you also can summon his brother Saurtr. This beast has such immense power that it used to be nearly impossible to take him on alone. Most adventurers used to take groups of three or even, in some cases, eight just to attempt taking this warrior down.

Thanks to Benjo for confirmation of Typhon's drops.