Berserkory acts almost the same as his original form, performing a medium-strength attack and firing a Wave Attack. However, the Wave Attack range has been tripled, so few Cats can avoid it. He only has one knockback and very high health, causing even more Wave Attacks if you don't use any anti-Red Cats. Luckily, he has lower range and movement speed, not to mention the lack of Base Destroyer.
If you have iCat, then deploy two of them out of sync. Because of Berserkory's low range and singular knockback, it's very easy to perma-freeze him on his own, making him extremely easy to defeat. Pairing units that can disable Reds like iCat with Wave Shields such as Octopus Cat and Cat Machine Mk 3 can further reduce his pushing power, as they'll simply stop his wave attacks.
One day I woke from a nap to find a Kory making stew in my kitchen. After I kicked him out for raiding my fridge, it seems the sunset on his back awoke his hidden dark powers.
An eccentric koala who woke up to cooking at Battle Cat's house while freeloading there. Only uses gourmet ingredients, so he was kicked out once again. At last, dyed by the setting sun, he has awakened to the secret of the "wave".
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His axe is the same as Axe Cat's, only bloodstained.
In his Japanese description, he was freeloading at the house of Axe Cat, rather than an unnamed narrator (which however could still be Axe Cat). Their Japanese names also match: Axe Cat is named Battle Cat while Berserkory is named Battle Koalacchio.