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Benefit

Any creature that comes in contact with the mucus cloud becomes poisoned. The creature must make a successful Fortitude save (DC 10 + half the aboleth's Hit Dice + Con modifi er) or take 1d4 points of Dexterity damage. One minute later, the creature must save again against the same DC or take another 1d4 points of Dexterity damage. Creatures that remain in the mucus cloud for multiple rounds must make additional saving throws each round. Aboleths, skum, and creatures transformed by an aboleth's slime attack are immune to the effect of Toxic Mucus and can move through the cloud without penalty.