Battle Cats - Hidden Forest of Gapra - Primeval Wood Area 19
Lots of Zombies and Aliens. Use Chief and Soap here to deal with all of the Zombies and Aliens. Cumulus Gallus spawns on a short timer here, supported by a huge wave of Zombies and Aliens, including Zory, Piggicus, Ariant, and Angaburu. Jagando is good here to deal lots of damage to Cumulus Gallus while the rest of your units deal with the other enemies. Chief is important for clearing out corpses.
Stage Drops:
Purple/Red Stone x2 - 5%
Purple/Red Stone x3 - 40%
Blue/Green Stone x1 - 5%
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Clearing 55 Behemoth Culling stages unlocks Ancient Egg: N111, which like Soap is in the SR category. To evolve it, you need 5 Blue Stones, 5 Yellow Stones, 1 Green Gem, and 1 Yellow Gem.
Once evolved, it becomes Cop Cat, an anti-Traitless midrange attacker/tanker very much similar to Pizza Cat. Admittedly, Cop Cat isn't very impressive at level 30 for when you get him. At level 50, Cop Cat has 54,000 HP, 2 KBs, 250 range, 19,440 damage, and 6,271 DPS. Cop Cat costs 1125 and has a 14.53 sec cooldown. Cop Cat is Strong vs Traitless and has Behemoth Slayer.
Effective Stats (Lv. 50):
HP (Traitless) - 108,000
HP (Behemoth) - 90,000
HP (Traitless Behemoth) - 180,000
Damage; DPS (Traitless) - 29,160; 9,406
Damage; DPS (Behemoth) - 48,600; 15,677
Damage; DPS (Traitless Behemoth) - 72,900; 23,516
Cop Cat is strictly inferior to Pizza Cat as a generalist, so it's restricted to its specialist use, which it's quite competent in. Cop doesn't have perfect matchups against Traitless since his 250 range puts him within range of enemies such as R. Ost and Mr. Mer which Cop would rather outrange, but his HP is enough to act as a brief shield against these enemies should there be enemies in the front he's good for. However, his arch-nemesis Hitman annhilates every enemy that Cop would be good against, so what's the point of Cop then? First, you can use both at the same time. Cop stands at the perfect range to cover Hitman's blindspot, dealing with melee range Traitless enemies that would otherwise sneak past Hitman such as Bore Jr. Additionally, Cop can use his large HP pool to fight enemies like Master A and Camelle that Hitman struggles to reach.
However, Cop's usage is still very limited against Traitless, especially when his performance as a damage dealer is effectively the same as Pizza just with less range and no Wave in exchange for HP. Where Cop actually shines is against Behemoth enemies. Even against non-Traitless Behemoths, his DPS far outperforms Pizza's except against Black Behemoths. Used as a general anti-Behemoth unit, Cop starts to get astonishingly good results. The only other egg unit that outperforms Cop against Behemoths is the indomitable Courier, so that is a great look for Cop. Against Traitless Behemoths, this is further amplified. 180,000 HP is more than enough to tank whatever Traitless Behemoths exist and ever will exist. Cop 2-shots the dreaded 200% Wild Doge and can easily deal with the likes of Papaou and even Strengthened Cumulus Gallus.
Overall, Cop Cat is a solid pickup from Behemoth Culling, though it's unlikely that you'll ever get him before unlocking Hunter's Map 4 to directly obtain the Behemoth Gems. Still, he's endgame-geared and ready to go, so get him up if you have the resources.