Location from Stardew Valley by ConcernedApe (Eric Barone)
An infinite, merciless descent beneath the Calico Desert — where the mines' training wheels come off and the valley's hardest challenges wait.
Skull Cavern is the game's endgame combat challenge. Unlike the mines, there's no bottom — it goes infinitely deep, with each floor harder than the last. It's where iridium ore is found in quantity, and where the game stops being cozy and starts being genuinely tense. There's no elevator, so every run is a fresh plunge. Bombs become essential. Food stacks are lifelines. The serpents can two-shot you. Mr. Qi's challenges often involve reaching deep floors here, making it the intersection of the game's combat and mystery endgames.
Accessed through a skull-shaped entrance in the Calico Desert. Inside: endless floors of increasingly dangerous enemies — serpents, mummies, iridium crabs — surrounded by iridium ore deposits. No elevator. No checkpoints. Each visit starts at floor 1. The deeper you go, the more iridium you find, but the deadlier it gets. Purple-tinged stone walls and alien atmosphere.
Also known as: Skull Cavern, the skull cavern, the desert mines