"You found a map to an Imploding Star inside of a supercooled dimension. The temperature there is perfect!"
Imploding Star is a unique map found in maps of level 170 and higher, which is required solely to complete the Devastation challenge.
The player needs a minimum of over 924.13Sxd (or 9.24E+53) combined health and block to complete it. That number is the minimum attack of the worst possible scenario on this map - fighting the cell 100 boss which attacks first - Neutrimp.
The player should aim for combined health and block of somewhere between that and the maximum attack of that imp (1.39Spd).
The following challenges end by completing Imploding Star: