At the start of each brawl, Upgrade your last character for this brawl only.
Ambrosia is a Level 5 treasure in Storybook Brawl.
This is a very situation-dependent treasure. Upgrading a character during a brawl is a very powerful effect, however some characters simply don’t work well in last place (bottom row, right). For example, I’m a great fan of Medusa, but would rather have her in first place (front left) than last, even with a free temporary upgrade. However Great Pumpkin King is one of the characters that works really well with Ambrosia.