As we know that the black hole is a lump of highly dense matter, and that's the reason for it's so strong gravitational force. Bat let us assume that it has sucked up a huge amount of mass and it's gravitational force has become of very high strength. Than what will happen. Will the black hole collapse in itself like a dying sun an give birth to another worst nightmare for the cosmologist or anything else will happen.
A black-hole is the most dense, most collapsed object or state of matter in the universe. To our knowledge, nothing really changes as a black-hole increases in mass except that it gets bigger, and its gravity stronger. Its properties are, for most intents and purposes, scale invariant1.
1: Hawking Radiation is, in a way, an exception to this, but not astrophysically relevant.
Well a black hole actually has 5 tons of mass or in other words a stellar hole if it collapsed into itself it would cause a hypernova Because according to the law of consevation of mass that mass cannot be created or destroyed but it can be rearranged in space therefor no mass can be .000000000000000000 Because that would mean a mass has been removed but most black holes have more than 10 times the mass of the sun my source is http://amazing-space.stsci.edu/resources/explorations/blackholes/lesson/whatisit/stellar.html