Golem Twins

The Golem Twins are enemy creatures in 12,000 B.C. in Chrono Trigger. Combined, they are the "boss" enemy in the Ocean Palace. They have the power to mimic whatever magic is used against them.

Lavos Beckons
Crono's party battles their way through the Ocean Palace and eventually find Dalton, who then sics the Golem Twins on them.