Herophiles,
Here's the setup:
I'm running what basically amounts to a New Mutants campaign. By numerous quirks of circumstance, the PCs happen to be accepting an award in the rotunda of the Guggenheim Museum in New York City, when several astounding things happen.
* Magma, whose mutant powers are just now coming to the fore (she isn't an NPC member of the team yet), essentially draws a magma flow up through the center of the floor, creating a smoking crater about 15 feet wide and God only knows how deep.
* Sentinels sense the immense power surge and fly down through the rotunda skylight, attacking the assembly. Six of them. The PCs manage to destroy three of them, and the other three escape with thorough scans of everyone present.
* Roulette of the Hellions uses her 'bad luck' mojo to bring down the entire Rotunda - thank heaven most of the bystanders have been evacuated.
What would be the major effects, both in Hero System terms and real-world terms, of these events? Would the Rotunda just collapse down the brand-new lavatube? Would the basement be eradicated? Would it bring the annex buildings down with it? What kind of seismic damage would be caused to the surrounding area (some VERY expensive real estate indeed)?
Thanks for any and all advice and assistance.
Yours,
Lord Hobie