Bubble

Bubble is the floating hook vermin players usually call Principality. It drifts calmly until something comes close enough to grab.

Every Bubble spawns holding a machination. Its threat is control: it hooks nearby targets, drags them around, and can lift them off safe ground into other hazards.

The held machination is not a strong reason to farm Bubble. Principality is fairly rare, the hook is easy to craft, and stronger options such as metal hook or gyro hook are usually better. If the Bubble has already landed hooks, the dropped tool can also be damaged or gone by the time it dies.

The notable drop is silver vessel at 10%. That is the item worth remembering, though even it is easy to replace.