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By the time you reach Caltheris in the Astra Malorum easter egg, you have already done a lot of work, maybe even run a few practice lobbies or checked out a CoD BO7 Bot Lobby to warm up. The fight is messy the first few times, and most wipes come from people shooting the wrong thing or grabbing the wrong power-up at the wrong time. The key is knowing what each phase actually wants from you, so you are not dumping Wonder Weapon ammo into an immune boss while the arena fills up with trash and lasers.

Phase One: Charging The Soul Box

In the first phase Caltheris is floating above you and, yeah, you can see him, but you cannot hurt him at all. Do not waste bullets there. Your real job is the soul box on the edge of the arena. You need to drag zombies over and kill them close to it so it fills up. While you are doing that, Caltheris keeps firing these tracking lasers across the floor. You will figure out pretty fast that standing still is just asking to get melted, so keep circling, slide if you need to, and call out when someone is about to get beamed. When your screen flashes blue, that is your signal: sprint to the box, activate it, and it rips a chunk of health off the boss. You have to repeat that cycle three times, so pace your ammo and do not panic if the spawns get thick.

Phase Two: Grounded Caltheris

Once you break him out of the sky, Caltheris lands and turns into a big tanky monster right in the arena with you. This part feels more like a classic raid boss. You will see small glowing weak points on different parts of his body; focus fire on those, one at a time, instead of spraying randomly. When you clear enough of the small spots, a big, obvious weak point shows up, and that is when you dump your heavy stuff, LGM-1 shots, Ring of Fire, all of it. The only attack that really catches people off guard here is the boulder throw. He hard locks onto one player, so if he is staring you down, just strafe hard left or right, do not try to outrun it straight forward. Keep that pattern going and his health bar will drop cleanly.

Phase Three: Caltheris Ascendant

The third phase is basically the “angry” version of the previous one. Caltheris grows, hits harder, and the arena space feels smaller even though it is the same size. You are still hunting glowing weak spots, still rotating between add clear and boss damage, but now you really need to respect his ground slam. If you see him winding up and you are anywhere near the impact zone, back off or you are probably going down in one hit. A lot of teams wipe here because they tunnel vision on weak points and forget to keep moving. Call out when you are reloading or reviving so someone else can draw his aggro, and do not be afraid to burn Field Upgrades earlier than you think.

Phase Four: Needle And Purple Pools

The last phase, sometimes called the Needle phase, takes everything from phase three and adds one more problem: the boulder now leaves purple pools on the ground that tick your health down fast. It is tempting to try and “tank” one to stay on a damage spot, but that usually ends with two people crawling. Treat the floor like lava and keep rotating around the clean areas while you keep popping weak points. After a bit, the brain jar drops a special power-up that basically works like Insta-Kill, Max Ammo, and a full Field Upgrade charge in one go. Do not grab it the second it lands. Wait until your squad is low on ammo or the arena is getting out of control, then call it out and pick it up together; that single pickup can flip a failing run into a clear, especially if you have been practicing in a cheap CoD BO7 Bot Lobby already.