A water weird was an elemental weird that was conjured to protect a pool of water. They were renowned for their power as diviners in matters related to healing.
The upper half of a water weird typically appeared like a beautiful, translucent, blue female humanoid composed entirely of water, but the lower half could appear serpentine or like a column of water rising from the pool.
“Before you drink from a fountain or pool, toss a copper coin into it. It’s a small price to pay for your life.”
— X the Mystic’s 2nd rule of dungeon survival