Alright, what do you do instead of climbing the tree then?

make camp and sleep

Billy walks up to you when you begin making the camp and tells you, "Hey, you could just sleep at my colony if you want to, or leave to go back to your home."

Severon says "let's go to the colony"

Billy leads you southwest, however some point along the journey 3 strange, deformed and amalgamated looking bats attack you three, roll for initiative.

5

Okay well Airsenhite goes first and draws his pistol before firing at bat A, he rolled an 8 and misses, Billy goes next and casts fireball on the bats, bat A rolled an 11 so it fails and takes 20 damage and every other bat takes 10, bat A is now dead and then the two bats attack Airsenhite and both miss and now it is Severons turn.

Severon is going to shoot his bow at Bat B then use Misty Step to move 30 feet ahead

14 to hit

That hits.

6 DMG

bat B dies and then Airsenhite shoots at bat C and deals 10 damage killing it, gain 100 XP.

Severon is going to fall on the ground because he has 6 hp left

Airsenhite curses in deep speech before running over to Severon and casting cure wounds on him, heal for 10 hit points.

Severon is going to smile and get up to kiss Airsenhite on the head before walking to Billy with fire in his eyes

Billy cowers before you but secretly holds a potion of sleep from underneath his robe.

Billy pulls the potion of sleep out and asks "Potion of healing?"

Severon will calmly say "Did you or Did you not know about those bats?"

"Well, I mean- I did, but, uhhhhh, you see there hadn't been any recent attacks so the colony had, uh, thought that they had gone into rest early, the head chief thought of that not me by the way," Billy says very nervously, Airsenhite walks over to you and whispers in your ear "By the way please don't kill Billy right now."

"I won't kill him" Severon says as he takes the potion to inspect it

The potion looks, smells and seems like a potion of healing. If you're still suspicious then make an Arcana or Nature check.