The Aurae Saga is an "expansion pack" of sorts of BTD6. It can be bought for 6000 MM after you've beaten Final Battle. It represents the story after the two empires, the Monkeys' Empire and the Bloons' Empire, allied. When you activate it, you'll:
- Unlock Bloons - Monkeys Alliance
- All tracks have an additional Diamond medal
- All bloons/blimps become Aurae Bloons
- Unlock the blueprint for the ultimate weapon, ΩΧ("Omegachi")
- Unlock the Reactor Core ~=MELTDOWN=~ Special Mission Pack along with its 4 bosses and 2 special tracks:
- The Hard mode boss is now Patchwork Bloon instead of Apopalypse Bloon/Genesis Bloon
Also, all the tracks you play will automatically be set to Hard in this mode,... with the addition of the Aurae Bloons! That's why the Diamond Medal is so important. NOTE: If you deactivate the mode, you'll lose access of everything above. The access can be regained by, obviously, reactivating the mode.