They don't... all we know is that from Othinus's words the presence of multiple calamities in the universe would destroy the universe and phases like she did or simply distort the world and cause an effect like angel fall. Nothing there states they would survive, and nothing definitively says they'd even destroy the universe and also again we can't quantify what the fuck presence is so we don't know how many calamities it would take to actually destroy the universe. I said that each archangel is probably equal to one calamity, not that one archangel is equal to all the calamities. OT 4 shows that the presence of one archangel in the universe would not destroy it or even the planet, and Mathers summoning all four of them is said only strained the planet to its breaking point, there presence didn't actually destroy the planet, them actually destroying the planet would require there spells, they couldn't do so with there mere presence. nothing makes them universal at best you can...