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Message: <blockquote data-quote="aco175" data-source="post: 7007904" data-attributes="member: 27385">I haven't run 20th level yet for 5e, and do not have 10PCs at all, but my experience so far with 5e is that things start to break down at higher levels and the scaling does not work as well.  I found that you can throw more than you think at the party and not kill them they way you think you will.  Check the "to hit" value of the monsters to the party AC levels.  If CR 11 monsters have +8 to hit and the PCs have 20+AC, you can throw more monsters at them since you will not hit as much.  I have 9th level PCs and just threw some goblins at them and it was a mid to tough fight.  I had over 40 goblins and 5 PCs with most of the goblins needing to roll between 15-19 to hit the PCs.  A fireball took out 10-12 at the start and the fighter was chopping 2 per round.  I would guess 20th level PCs couldn't kill the CR11 monsters in one round by themselves, but with 10PCs I would expect 2 of them to fall each round.  I like to have encounters with 1 powerful monster and a few mid level monsters and maybe a few pest monsters.  For the 10 PCs at level20 I would throw 2-18CR monsters with 6-11CR, and 15 to 20- 5CR.  This should be a tough fight with lots going on, but I wouldn't worry too much.</blockquote>