You were fighting in the alien creatures in the Colosseum in italy , till Lord Achriman summoned the gargantuan creature standing 361 ft above it was a crustacean-like organism. It had massive pink and green spider-like creature

Attacks it can make acid spit balls which make small flying creatures called Beetles then it can lift it's arm to spawn more creatures it is very powerful

And it's heavy durability protecting it