Encounters might be a meeting with a patrol of guards at an old shrine or a familiar looking for aid. It might be an ambush in the wilderness, a stand-off in the city or a monster in the Underdark.
At a narrow cave entrance by a sparkling pool. someone is shouting for help nearbyThey are near their lairIn a fight they attempt hit and run tacticsDifficulty... 150.0 Easy
Snow (heavy precipitation, DMG pg 110)At a hidden tunnel entrance surrounded by permafrost
Chumbyxirinnish Jheri is a tenacious dragonborn acolyte with colorful tattoos. She loathes bullies and has has bad news for one of the PCsAt a temple of a power of trickery with a patch of dead mossThey are performing a ritual
They are caught in a trap and can't escapeAt a cliff with steps cut into it. The area is touched by shadow magic. there are insect tracks that look freshThey are guarding the local area
At a few concealed cave entrances. There is a patch of damaged sedge. A white (or bright red) fur-lined tentThey are patrolling for threatsIn a fight they retreat when half their number have fallenPossibly... during the fight a non-combatant stumbles into the areaDifficulty... 437.5 Deadly