Underdark Encounter Complications and Activities for DnD 5e

"There is a cracked crystal structure ready to shatter."

Tables for Encounter Complications, Encounter Activities or States and Encounter Sentient Activity for the Underdark. Result is from Underdark Encounter Complications.

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Underdark Encounter Complications and Activities

What makes this Underdark encounter different?

Maybe they there is a minecart and tracks or prisoners from the surface. Maybe they are telepathic or rescuing a companion from a rockfall . Or they could mining metal or lost in the tunnels.

There is a 5e Underdark random encounter generator at ChaosGen.

There is also a pdf of these and more tables at the DM's Guild as Underdark Encounters.

Underdark Encounters Terrain Encounters Bundle for 5e

Underdark Encounter Tables - creatures | locations | non-combat | complications

Underdark Encounter Complications

1d8+1d12Underdark Encounter Complications
2 There is a second group of creatures nearby (roll again on the appropriate encounter table)
3 There is a crossing to the Shadowfell here or there is a planar portal / magic circle here
4 There is a hidden item or cache here. Roll on Minor Underdark Treasures
5 Something lurks nearby - 1d3 gray oozes (or roll on Fungi and Oozes)
6 There is a chute with a flimsy covering or roll on Underdark Combat Terrain
7 Nearby is a powerful creature those encountered try not to disturb. Roll or pick a result from Underdark Encounters Level 11+
8 There is a cracked crystal structure ready to shatter or roll on Underdark Combat Terrain
9 The creatures are carrying a magic item or it is hidden nearby. Roll on Magic Items - Underdark
10 There are minecart tracks and a minecart or roll on Underdark Combat Terrain
11 There is a subterranean river (or lake) here and a raft (or other watercraft)
12 There is a secret door (or chute) here. It leads to a place safe to rest with food and water.
13 There is an area of Brown Mold or roll on Underdark Hazards and Obstacles
14 There is a prisoners (or slaves) in the encounter (or hiding nearby). Roll on Underdark Slaves
15 There is an area of sharp stones (treat as spike stones) or roll on Underdark Hazards and Obstacles
16 There is a hallucinatory terrain (or progammed illusion) spell here
17 There is a pocket of flammable gas or roll on Underdark Hazards and Obstacles
18 The area is affected by a mirage arcana (or hallow) spell
19 There are beasts as pets / guards (or nearby). Roll on Underdark Beasts
20 Area is cursed by a deity or spirit. It is Desecrated Ground (DMG pg 110). An undead may be lurking (roll on an Undead Encounter table)

Underdark Encounter Activities or States

1d4+1d6Underdark Encounter Activities or State
2 They are performing a ritual or one or more are telling a story
3 They are studying inscriptions (or pictures) or creating some art
4 They are searching for secret doors (or traps) or studying a portal
5 They are having an argument or they are intoxicated on a fungal (or mushroom) brew
6 They are creating some art or they are carving on tunnels
7 They are waiting in ambush for someone or playing with a pet
8 They are following a guide or having a celebration
9 They are foraging for sustenance (or fungi)
10 They are digging (or blocking up) a tunnel or they are tending fungi
11 They are lost or they are on patrol
12 They are making (or following) a map
13 They are partway through (or starting) a journey
14 They are preparing or consuming food or they are playing a game
15 They are building (or rearming) a trap or they are searching for ore
16 They are mining or they are hunting a beast
17 They are talking with someone (roll on Quick Underdark NPCs)
18 They are searching for a person or place
19 They are searching for the party or other adventurers
20 They are making a raft (or other watercraft)

Underdark Encounter Sentient Activity

1d8+1d12Underdark Encounter Sentient Activity
2 They are performing a ritual or one or more are telling a story
3 They are studying inscriptions (or pictures) or creating some art
4 They are searching for secret doors (or traps) or studying a portal
5 They are having an argument or they are intoxicated on a fungal (or mushroom) brew
6 They are creating some art or they are carving on tunnels
7 They are waiting in ambush for someone or playing with a pet
8 They are following a guide or having a celebration
9 They are foraging for sustenance (or fungi)
10 They are digging (or blocking up) a tunnel or they are tending fungi
11 They are lost or they are on patrol
12 They are making (or following) a map
13 They are partway through (or starting) a journey
14 They are preparing or consuming food or they are playing a game
15 They are building (or rearming) a trap or they are searching for ore
16 They are mining or they are hunting a beast
17 They are talking with someone (roll on Quick Underdark NPCs)
18 They are searching for a person or place
19 They are searching for the party or other adventurers
20 They are making a raft (or other watercraft)

More Encounter Tables

There is a 5e Underdark random encounter generator at ChaosGen. And a separate tool for encounter locations including Underdark.

There is also a pdf of these and more tables at the DM's Guild as Underdark Encounters.

Underdark Encounters Terrain Encounters Bundle for 5e

You can get encounters tools updates on Patreon and find me on Twitter @duncanthom