Demon COO is the third stage in The Devils' Academy.
- 1 Calamary spawns after 8.33 seconds250f.
- 1 Calamary spawns after 25 seconds750f.
- 1 Calamary spawns after 41.67 seconds1,250f.
- 1 Calamary spawns after 58.33 seconds1,750f.
- 1 Dolphina spawns after 5 seconds150f.
- 1 Dolphina spawns after 16.67 seconds500f.
- 1 Dolphina spawns after 33.33 seconds1,000f.
- 1 Dolphina spawns after 50 seconds1,500f.
- 1 Dolphina spawns after 66.67 seconds2,000f.
Nearly any Uber Rare or Legend Rare with resistance against floating or alien can pretty much solo this stage, so use them if you have them, just do not summon shorter ranged cats, as they may cause the Dolphinas to hit such unit.
Lineup: Catellite, Octopus Cat, Bullet Train Cat, Awakened Bahamut Cat, a Wave Attacker of your choice (Slime Cat works). Fill the first row with Attack Up and/or Defense Up Combos especially if your units are low leveled.
Start with your wave attacker of choice and start spawning Octos whenever you can. Then use rush units to speed up the killing process and you will eventually win.