"You encounter a hostile denizen." Well, that's simple enough. Based on this result, I'm going to say whatever this thing is, it immediately comes after us.
For grins, let's roll up a Monstrosity using the Delve oracles.
Size: Small (hound sized)
Primary Form: Crustacean
Characteristics (keeping only 3 or less):
Wings, Fangs/Rows of Teeth, Antennae/Sensors, Mandibles/Pincers
Abilities (keeping only 3 or less):
Breath weapon/toxic spew, Crusher/constrictor, Intimidating vocalization, strong
Now, putting it all together:
"Shadow Crab"
A black, crab-like beast about the size of a mastiff. It has two large pincers, and three stalked eyes that can be oriented in any direction, or withdrawn into the body to completely protect them. On the body between the pincers is circular mouth that when opened reveals three rings of razor-sharp teeth. An organ deep inside the body is capable of generating sounds, including speech, though this speech has a reverberation to it that is unnerving. Though not terribly large, the creature is immensely strong. It is also able to exude a cloud of black, shadowy gas from holes in its carapace. This cloud is toxic to breathe.
This thing is just going to come out and attack us. So we'll be starting combat. Since we're still early in our adventure, I say we make this combat Dangerous in rank. I'll come back to make an IC post later. If anyone else wants to start the fight before then, have at it!
Rolls
Reveal a Danger - (1d100)
(52) = 52
Monstrosity Size - (1d100)
(11) = 11
Monstrosity Primary Form - (1d100)
(67) = 67
Monstrosity Characteristics - (1d100, 1d100, 1d100, 1d100)
1d100 : (44) = 44
1d100 : (9) = 9
1d100 : (75) = 75
1d100 : (67) = 67
Monstrosity Abilities - (1d100, 1d100, 1d100, 1d100)
1d100 : (74) = 74
1d100 : (56) = 56
1d100 : (8) = 8
1d100 : (36) = 36