When each turn starts, if you deployed 2 or more Aquatic units last turn, choose an arena. Each of your Aquatic units in the chosen arena gets +10 speed and Stun 1 until end of turn.
Keywords
Stun
Stun X: A cumulative ability triggered during the damage placement POP that means, "When this unit damages another unit, that unit gets –X power until end of battle." If no damage counters are placed as a result of damage, Stun doesn't occur. Stun works anytime the unit damages another unit, not just when it attacks. Only the unit with both Deflect and Stun abilities can stun when it activates its Deflect.