Galactic apocalypse blackhole

A blackhole so massive that it can swallow an entire galaxy.

'Several hypermassive blackholes, at the centre of different galaxies merged to create a blackhole so large that it became a galactic apocalypse blackhole, which swallowed an entire galaxy whole, but even that's nothing compared to a universal apocalypse blackhole.'

(Please read my definition of a hypermassive & universal apocalypse blackhole).