You have resistance to acid and poison damage, and you have advantage on saving throws for getting poisoned.

You can use your bonus action to alter your shape, granting yourself arms and legs by manifesting two pairs of arms. One pair can support up to 10 pounds, but does not allow for any attacking actions. Changing your shape requires a bonus action. To turn into your original blob form, you do not expend any actions. You have an advantage on checks made to initiate or escape a grapple, and you can squeeze through spaces as narrow as 1 inch in width.

You gain darkvision for 60 FT.

You are capable of holding your breath for up to one hour.