Yes, the bucket is gated behind clay and mob drops. Here's the exact progression path so you don't waste your first weekend.
Why iron is locked
Kappa rewrites the recipe book from the ground up. Even a humble iron bucket sits behind a multi-step climb — this is the pack, uncompromised.
The path, in order
Clay → primitive kiln → mob-drop reagents → early alloy → your first bucket. Skipping a step just sends you back to it.
/recipe bucket.iron
/rift progress
Do not buy your way past it
The Rift Survival Kit smooths the edges, but the gate is the point. Beat it and the rest of Kappa opens up.