It all depends on what kind of game you want to run. On the flip side, the CR could be a simple 1, as per the Noble stat block-easy to kill, but her strengths are in coin, charm, and influence. Maybe he's the Lord of the Local Crime Syndicate™ and beating him means killing/bribing/imprisoning/driving away his loyal following. Bosses can be defeated in other ways than combat, so if you want the LEB to be a CR 15 Archmage, make it so.

The CR of the Local Evil Boss can be whatever you want it to be.

The tribe could be somewhere such as a decaying swamp consisting of corporeal and spectral undead, such as the typical skeletons and zombies (CR 1/4), shadows (CR 1), spectres (CR ), wights (CR 3) and ghosts (CR 4).all of them led by a terrifying wraith (CR 5) or necromancer (CR 4–CR 7). The mid-level monster tribe is something your party might encounter early on as a major threat to the land, but won't fight until about 4th or 5th level.Orcs and bandits would absolutely fit that category and are staples of D&D games. Anything that constitutes a “low-level” tribe is anything CR 2 and below, as recommended above.

The big tribe leader could be something like a goblin shaman ruling (CR 1) or a fat ogre (CR 2).

You're gonna wanna look for cannon fodder mooks that range anywhere from CR 0 to CR 1/4, and you're gonna want lots of ’em dotted around. The monster tribe could consist of creatures such as gnolls, goblins, kobolds, bullywugs-but any bipedal/ humanoid creature works extremely well.

Instal the new for ios Monster Tribe