Making encounters in Nimble is easy! Simply add up the total levels of the heroes (e.g., if you have 3 level 2 heroes, their total is 6). Monsters with a total level equal to that will be a hard but fair fight; less than that: medium or easy; greater than that: deadly, or very deadly.
Example A griffon is a level 4 monster. So a flock of 6 griffons (24 monster levels total) would be a hard encounter for: 6 level 4 heroes, 4 level 6 heroes, or 3 level 8 heroes.
Typical encounters should have 1–4 monsters per hero (excluding minions). For an epic fight against a single bad guy, use a legendary monster, and if you want hordes of monsters, use minions.
Important Note! If the heroes or monsters greatly outnumber one another the encounter may be easier or harder than anticipated. 1–4 monsters per hero is the sweet spot for most encounters.