Hot Magic

 is an upgrade in the Magic Monkey Knowledge tree. It allows all Magic Monkeys to pop Frozen Bloons, which in effect improves Ninja Monkeys, Super Monkeys, and Druids. It requires Lingering Magic.

Summary
Hot Magic helps increase synergy of all Magic Monkeys with Ice Monkeys. In particular, this strongly helps Ninja Monkeys, as the Ninja's main firepower generally comes from their shurikens.

Tips

 * This is most useful for Ninja Monkeys, Super Monkeys, and Druids, but most especially the first two. There is no effect for Wizard Monkeys or Alchemists, as all their attacks already pop Frozen by default.
 * For Druids, Hard Thorns is no longer required to pop Frozen.
 * Laser Blasts or Tier 4 Super Monkey upgrades are no longer required for Super Monkeys to pop Frozen.
 * Ninja Monkey shurikens can now damage Frozen without needing MIB.

Trivia

 * Hot Magic's icon suggests that the Magic Monkey attacks have been heated with fire.