Oathbreakers

OathBreakers is an achievement in Bloons TD 6, obtained by reanimating 250k bloons with the Necromancer (including Prince of Darkness as well).

Summary
Spam Necromancers while still surviving against high-HP rounds, to which Necromancer's Undead Bloons are weak towards. Also helps to add a Prince of Darkness as well.

Tips

 * Try an easier map and place Necromancers close to the main action to maximize growth of undead bloon graveyards.

Trivia

 * The achievements name, "OathBreaker" is a reference to most popular media stating how wizards only practice light magic, and how Wizard Monkeys become necromancers, henceforth "breaking" their oath.
 * This also bears a possible reference to the Army of the Dead in Tolkien fiction, who are also regarded as the "Oathbreakers."