Contact Cheats

When you beat the game, an extremely powerful yellow cow appears in Caladoxia Ruins. If you unlock the doors to its room and lure it to the L-shaped staircase where you leave that part of the ruins, it will not be able to attack you. You can then climb halfway down and go into battle mode, and Terry will automatically keep attacking it with any weapon. It will take a very long time to kill and his weapon rank for that weapon and strength will max out after a while.