Nachthla

From LSWiki

This is a titanic spider apparently composed of some shimmering substance, sometimes seeming only half-real, sometimes giving a terrifying impression of being infinitely more real than its surroundings. You recognize it as the manifest form of Nachthla, one of the unspeakably ancient lloigor. Its habit of assuming the form of a tremendous spider is well-known, though its reasons for doing so are not. It is likewise known for surrounding itself with arachnoid beings in the lairs it sometimes inhabits; some obscure accounts hold that Nachthla is the ultimate progenitor of all spiderkind, and looks through all of their myriad eyes, studying the world for inscrutable and horrifying purposes. It looks about six hundred eighty-five dimins long, six hundred eighty-five dimins wide and two hundred thirty dimins tall.