That's not a mascon, that's a Shoggoth.
Well, whatever you do, don't summon the Shoggoth.
"The Shoggoth should be VERY powerful as thought-form entities go. It should also be (or rapidly become) fairly independent and capable of autonomous action. With continued existence and use the Shoggoth will seem to develop its own "personality" and can become troublesome. If the Shoggoth becomes rebellious it may be necessary for the magician to destroy the Shoggoth. A standard but thorough banishing and the destruction of the Sigil should suffice."
You H.P. Lovecraft fans are determined to ruin the Quaternary for the rest of us.
Al Hazred University was at Ground Zero of the impact.
The Shoggoth was formed from the fused minds of the scholars and students there, who were so traumatically & simultaneously killed.
Many secrets lie buried under the ice and beneath the sea.
Disturb them at your peril!