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Destroy is a Sky action that allows you to instantly win combats.
Availability
This action is unblocked via the Halos of various Airships, each such Halo opens up the Destroy action for a specific type of combat.
- Monster Islands: Requires Goblin Airship. At max rank allows for enemies up to 150% of our Energy
- Colossus: Requires Hovering. At max rank allows for enemies up to 180% of our Energy
- Player Airships: Requires The Alliance. At max rank allows for enemies up to 100% of our Energy
- Space Rifts:
- Blue Space Rifts: Requires Behemoth's Horn. At max rank allows for enemies up to 450% of our Energy
- Green Space Rifts: Requires Behemoth's Heart. At max rank allows for enemies up to 450% of our Energy
- Yellow Space Rifts: Requires Behemoth's Wings. At max rank allows for enemies up to 450% of our Energy
- Red Space Rifts: Requires Behemoth's Claw. At max rank allows for enemies up to 450% of our Energy
Improvements
- Invader's halo allows you to use the Destroy actions as if your energy was higher by up to +36%.
- Destroy System Enhancement from Robot Army tree in Tech Hall increases this further by +4%/X%/X%/X%/X%
These are multiplicative with Goblin's effect. So, for instance, if you own Goblin at rank 6 (150%) and Invader at rank 6 (+36%), you'll be able to Destroy enemy Monster Islands with Energy up to 2.04 times your own Energy because 1.5*(1+0,36)=2.04.
Rewards
Rewards for winning a fight in this manner are the same as the normal rewards. It is unknown how exactly the Obisidian Ray bonus 
are computed but they are awarded as if the fight had lasted a few rounds.