Bladderwrack is an I.C.E. Age algae found around Claedesbrim Bay (Modern: Darkstone Bay). "Wrack" happens to be Seoltang for unhappy or cursed, but "bladder" probably is not. When consumed it is supposed to cause cramping and vomiting. Bladderwrack was supposed to be converted to "gallowrant" in the De-ICE transition, but still appears in rare instances as bladderwrack.
[Beach Area, Small Cave] Water from the high tide has left numerous puddles on the floor of this low, cramped cave. The air has a stale, moldy odor, possibly coming from the decaying patches of bladderwrack that cover some of the rocks. A dark narrow tunnel leads off to the west. Obvious exits: west
Behind the Scenes
Bladderwrack comes from the flora section of the Quellbourne (1989) source book module for Shadow World. The "wrack" is consonant with the fictional Seoltang local trader's language, whose words are largely contractions of ordinary words. It is also a real world algae (Fucus vesiculosus) of the North and Baltic Sea with a history of being taken for iodine deficiency, so there is a reasonable case for it not needing to be converted to gallowrant as the term cannot be copyrighted. The term "bladderwrack" itself descends from blædderwærc, an Old English word for pain of the bladder.