Invocations to Dagon

Invocations (AKA "Invocations to Dagon") is statted out in the Call of Cthulhu 7th Edition Rulebook, and originates in August Derleth's "The Black Island (fiction)".

Description

My grandfather's papers were wrapped in oilskin and I had had them with me for years. I had examined the small packet from time to time, with curious stirrings and misgivings. They consisted of fragments of an old diary — some pages had been torn out here and there; of fragmentary letters; a few documents, and some of what purported to be my grandfather's own writings entitled simply: Invocations, though down in one corner someone had added: to Dagon. The Invocations came to hand first. These were evidently intended as at least semi-poetry, and were written in a manner at times coherent, at others apparently incoherent — unless, as I was now prepared to admit, I lacked the proper key to understanding....
-August Derleth, "The black Island (fiction)"

An eccentric diary by Asaph Waite, with the pertinent entries dated around 1928 relating to peculiar events surrounding the town of Innsmouth in and around June, 1928. Waite quotes the R'lyeh Text.

• author: Asaph Waite
• date: c. 1928
• language: English
• number of known copies (if rare): (unknown, presumably rare)
• last known location of surviving copies (if rare): (unknown)
• study: 16 weeks
• sanity loss: moderate
• mythos lore: moderate
• occult lore: ?
• spells:  ?

Associated Mythos Elements

• location: Innsmouth
• tome: R'lyeh Text
• race: Deep Ones
• deities: Dagon and Hydra, Cthulhu
• cult: Esoteric Order of Dagon

Appearances

• fiction: August Derleth, "[[The black Island (fiction)]" (numerous quotes; the tome/diary provides the backbone of the story's text and plot)
• fiction: H.P. Lovecraft, "The Shadow Over Innsmouth (fiction)" and The Call of Cthulhu (fiction) (Derleth's story is basically a sequel/reboot/retelling of Lovecraft's original stories)
• sourcebook: Call of Cthulhu 7th Edition Rulebook