Yttrium

Yttrium is a material that can be only found by shearing a Boombot or by smelting a Yttrium Form in a furnace. It is used to craft frog food, Smash Sword, Smash Axe, Smash Spear, Brawl Poker, and frog spawn eggs. You can also use it to make brawl armor or yttrium blocks.