Whatever would damage wet wood will damage the driftwood monsters. Because they don't feel pain, they must be completely annihilated to be stopped; even detached limbs will continue towards the hospital. However, any kind of cleansing, purifying, or sunlight-based magic will turn them to ash.
As for the tentacle monsters on the beach, they are vulnerable to physical attacks between and beneath their bone plates.
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As for the tentacle monsters on the beach, they are vulnerable to physical attacks between and beneath their bone plates.