Great keepers are living statues made out of solid gold, having the appearance of muscular, bearded men wearing togas, their left fist permanently raised into the air. Their eyes glow with blue light. The golden giants are known for delivering devastating attacks with their enormous fists or stamping the ground violently. True to their Japanese name, great keepers are the heavenly gatekeepers of Zenithia, although in some games, they will even serve as guardians for the lairs of demon lords, as well.
Great keeper appears as a SS-rank monster of the Material family exclusive to the SP version of the game. It can be synthesised with a special combination of a Living statue and Gem slime.
They might literally have hearts of gold, but they're not overly accommodating of unwelcome guests, turning away would-be trespassers from Zenithia before they can even get a foot in the door.