New boss: Caged Crawler

The caged crawler is a gigantic spider concealed in mob spawner like armor, having a diameter of 10 blocks. This mob is heavily armored and has a lot of health, so be careful.

Stage 1: The crawler will summon spiders and cave spiders fairly often. It will commonly spit large fireballs at you, which you can deflect back at the crawler using melee or ranged attacks. Successfully deflecting the attack will cause the crawler to heat up for 15 seconds, which will make it take 25% more damage, but also make it more aggressive; this effect may stack. After this stage, the crawler's armor will become slightly damaged and it will take 50% more damage.

Stage 2: The crawler will often bundle into a "ball" and roll around the arena, summoning mobs behind it. Periodically, it will shoot a beam of fire (which cannot be deflected). It will also charge at you in rolling form which is quicker but covers less area, or in normal form which is slower but covers more area. After it charges at you in rolling form, it will heat up for 15 seconds and un-bundle itself. After this stage, its armor will break and it will take 100% more damage than in stage 1.

Stage 3: In this stage, the crawler will no longer be able to summon mobs because its spawner armor broke. It will often charge at you quickly in normal form, which is best dodged with a roll. It will also crawl around and shoot giant webs at you. Periodically, it will jump up and land on you, causing high pushback.