Rancid water cascades from this translucent shape, outstretched fingers dripping with disease.
Rain Golem: Init +2; Atk 2 slams +5 melee (1d8 plus 1d4 disease DC 14); AC 4 ; HD 5d8; hp 40; MV 15′ swim 90’; SP mist cloud (50% ranged miss chance), construct traits, detect magic at will, immune to magic, immune to fire, weak to cold, frozen core (10% chance of becoming 5 HD ice golem if killed by cold); SV Fort +3, Ref +1, Will +5; AL N.
A rain golem is a monstrous construct in a vaguely humanoid shape made of filthy water. They move by dragging themselves along with elongated arms. They are extremely rare, formed from the collection of rain water passing through the gutters of a magical tower in an city. The concentration of magical energies in the sewers underneath the tower can lead to the spontaneous creation of a rain golem, a creature of rancid water that seeks to destroy all sources of magic.
This one needs a bit of explanation. Janelle Shane created a list of D&D monsters that was generated by her research into neural networks (http://aiweirdness.com/post/172170729017/dungeons-and-dragons-creatures-generated-by). James Holloway (http://gonzohistorygaming.blogspot.com/) ran a contest to create a monster from that list of names. This was my entry.
I tried to keep it system agnostic but has a bit of Pathfinder and 3.5 in it.