I've already done Ghatanothoa, and there is only one other Ancient One in the game that I think requires additional information to fully understand the reasons for the rules behind him.

From Wikipedia: "Bokrug (The Great Water Lizard) first appeared in Lovecraft's short story "The Doom That Came to Sarnath" (1920). The being is also part of Lovecraft's Dream Cycle.

Bokrug is the god of the semi-amphibian Thuum'ha of Ib in the land of Mnar. The deity slept beneath the calm waters of a lake that bordered Ib and the city of Sarnath. When the humans of Sarnath cruelly slaughtered the populace of Ib and stole the god's idol, the deity was awakened. Each year thereafter, strange ripples disturbed the otherwise placid lake. On the one-thousandth anniversary of Ib's destruction, Bokrug rose up and destroyed Sarnath (so utterly that not even ruins remained). Afterwards, the Thuum'ha recolonised Ib and thenceforth lived undisturbed."

Sounds fair enough to me...

Not really the all-encompassing, unspeakable-lest-you-go-mad, waiting-to-destroy-all-of-mankind sorta Evil most of the Old Ones we've got in the game. Hell, I'd have done the same if I was in his position.

But then ol' Howie sometimes had lopsided ideas of what was evil (cf: Red Hook). I sometimes feel kinda inadequate getting excited about a Mythos created by a guy who'd have been likely to faint dead away or go "livid with rage" at beholding my mixed race heritage .