Well as the titel says.
While the Revenge of the Cartel’s event was going there were hoards of enemies on like every map and on high mayhem levels it got really though.
I quite enjoyed this it gave the game more challenge every encounter was not easy u had to muscle your way through.
I once came up with a DarkSouls esk mayhem mod that make random rare spawn enemies appear in mobs this would quite function similar to the RoC spawn in.
Also, a good way to make the game harder without changing anything would be make random bosses appear on any map, there could be 2 or 3 bosses at the same time.
All I’m saying this would be the level of toughness i would expect from mayhem mods on M8 and higher.