Accumulates experience as you do. When fully charged it produces 20 Tentacles of Q’bthulhu. This effect can only trigger once a week.
The Ropey Readings is a Tome bought in the Shadowy Market for 1 Lunar Soul. They produce 20 Tentacle of Q’bthulhu, when they are fully charged. Unlike Common Tomes (that can be used as often as you like without cooldowns), these tomes can only be used once a week, although, they provide more rewards than Common Tomes per individual use.