Level 27

This stage has many Obsidias as enemy monsters.

Strategy
The reason this stage is annoying is because you can't use Firetaur to utterly destroy the Obsidias since they are also Dark monsters. Another reason is because the Obsidias will lower your accuracy every two seconds.

Strategy 1 (two stunners)
Monsters: Freetle, Vapwhirl, Sealion or another Vapwhirl

Moves: Vapwhirl and Sealion both need Shutdown and Nuclear Heat.

Runes: Vapwhirl needs 3 Speed, Sealion 3 Team Speed, and Freetle 3 Strength

What to do:

Let Vapwhirl deny the enemy team with Shutdown. Now Freetle and Vapwhirl will slowly kill the enemy team using Fire Dart and Nuclear Heat. Once the enemy team has been defeated, you will go to the next wave. Vapwhirl will probably have his stun move in cooldown, so that's why we have Sealion to deny the team again. From here you will do what you did in the above strategy.

Strategy 2 (ft. Monthly Calendar Monsters)
Monsters: Hellberus, Hydnora, Vapwhirl

Moves: Vapwhirl needs Shutdown, Hellberus and Hydnora need moves that applies Burn, Poison and Nightmares

Runes: Hellberus and Hydnora need Team Speed, Vapwhirl needs Speed

What to do:

Once again, let Vapwhirl stun the whole team. Now Hellberus and Hydnora apply Burn, Poison and Nightmares to all enemies one by one. If all these status effects stack, they remove 30% of life each turn! Once all enemies die due to this, do the same thing in the next wave.