|Creature Slaughter Round||Level||Reward|
|1||25||2858 XP, $1530|
|2||25||2858 XP, $1530|
|3||28||3491 XP, $2149|
|4||28||3491 XP, $2149|
|5||30||3945 XP, $2696, Rocket Launcher (Creamer|
This Circle of Slaughter was initially a pre-order bonus for Borderlands 2 on PC, Xbox 360 and PS3, but was later added to the storefronts as separate DLC ($4.99). Later on, this was included in the Game of the Year Edition, as well as the Handsome Collection on PS4 and Xbox One. You will find the entrance to Natural Selection Annex in Wildlife Exploitation Preserve, right next to the Ammo/Health dispensers you will come across as you enter the area with Bloodwing's holding cell.
The Creature Slaughter Dome will pit you against the various creatures of Pandora, with not a single human or robotic enemy in sight. You will be facing Skags, Spiderants, Varkids, Bullymongs, Stalkers and Threshers, which is a wide variety of enemies. As with the other Circles of Slaughter, you have to face waves of enemies before the round is over, after which, you will be able to stock up on ammo and health (should you need it) before starting the next round. One of the more annoying features of these missions is that the arena is fairly small and is uneven in spots, where you might get stuck sometimes.
During Round 1, you will face nothing but Spiderants and Skags, so you don't have to go crazy with a large variety of enemies. Remember that Spiderants have a critical hit spot on their abdomen, but it can be hard to hit sometimes, since they rarely turn around on their own. Round 2 will introduce Varkids into the mix, with you encounter both a Super Badass and Ultimate Badass variant. Be very careful around those Badasses, as they take a lot of punishment and can also dish out a lot.
You will find Bedrock Bullymongs in Round 3, as well as some Badass Skags later on in the same round. If you're using elemental weapons, you may have trouble with the Badass Skags, since they always have one of four elementals. Round 4 doesn't seem particularly long, but you will face Stalkers and Threshers. The Threshers start out with individual tentacles that must be destroyed before the real body shows itself. The final round will have everything from before, culminating with a Badass Pyre Thresher, one of the more dangerous enemies in the game.