Sinking is separated into two sections.
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If Sinking is on YOUR CHARACTER: each hit from Sinking lowers your Sanity by 1, reducing the Sinking-stack by 1. When a target misses you, take Xd8 of Sinking damage and then halve the stacks for EACH miss on you. At the start of a new round, remove 3/4ths of the Sinking-stacks (so halve twice).
This means: 8 stacks. 1 miss, you take 8d8 points of damage and halve your stacks to 4. Another miss, 4d8 points of damage and halve your stacks to 2, ad effectum.
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If Sinking is on THE ENEMY: Each attack YOU MISS deals xd8 of Sinking damage, and halves the stack each time you miss the attack. At the start of a new round, remove 3/4ths of the Sinking-stacks (so halve twice).