A Whole Damn Army Simplified

I have discovered a shortcut for making Group/Horde monsters into A Whole Damn Army of its own

If two questions would grant the same tag don’t worry about it. If you like you can adjust damage or HP by 2 to reflect the tag that would be repeated, but it’s not necessary.

What I'm about to tell you is strictly not RAW... but it is simple. You ready for it? Here Goes:

Take any Core example monster of Horde or Group organization sizes and add 1 instance of Uncanny Endurance (+4 HP) for every multiple of the party's number. So a party of 4-5 members fights a horde of 50 whatever as if it had 10-12 levels of Uncanny Endurance.

If they number more than 50 or so, you should probably also add Huge since a platoon is roughly 4 squads of 10. That and 50 people probably don't fit into a house. This addition is optional though.

For the purposes of Damage From Multiple Creatures, add +1 per Uncanny Endurance (equal to +1 per multiple of the party's population) rather than one per individual monster. If the party has allies that make the ratio smaller, don't increase damage as much as normal (to reflect the fact that some of the damage goes to the players' allies). So for example, in the above 10-12 levels of uncanny endurance, the party would take the full +(levels) of damage if they were the only combatants. If they had 20 allies though, the ratio is 2/5 so players would take +4 damage instead of +12.