Encounters of the Astral Sea for Spelljammer

The Opportunity is a Shrike carrying 2d4 hadozee shipmates (BAM), a merchant priest and a cargo of expensive wines

Encounters in the Astral Sea using monsters from Spelljammer and the Monster Manual.

Tables for Astral Sea (levels 1-4 & levels 5-10), Astral Sea Encounter Details and Astral Sea Beasts.

[Art by Indi Martin]

Encounters of the Astral Sea

The Astral Sea is the way between worlds of D&D. It is a place traveled by astral projection, a few native monsters or outer planes creatures such as slaads, angels and Modrons.

And Spelljammer ships carrying neogi, astral elves, plasmoids, mind flayers and weirder crew. It's a place of Dead Gods, gateways to other realms, astral dominions of divine powers and Wildspace Systems such as Realmspace of the Forgotten Realms.

More tables at Spelljammer Encounter Tables on DM's Guild

Astral Sea (Levels 1-4)

d20	Astral Sea lvl 1-4
1	Runic Ray is a Flying Fish crewed by 2d6 bandits with a cult fanatic captain. They are trying to contact a star kraken; or roll on Ships lvl 1-4
2	The Opportunity is a Shrike carrying 2d4 hadozee shipmates (BAM), a merchant priest and a cargo of expensive wines or roll on Ships lvl 1-4
3	1d6 space eels (BAM) or roll on Astral Sea Beasts
4	1 pentadrone turned rogue or 1 barghest* (MotM)*
5	1 succubus/incubus or 1d3 spined devils
6	1d3 aartuk warriors (BAM) or a portal as a swirling whirlpool of colors
7	Sword and Shield is a Wasp carrying bickering adventurers. 1 spy, 1 drow, 1 acolyte, 1 scout and 1 thug or roll on Ships lvl 1-4
8	1 brown scavver (BAM) or roll on Astral Sea Beasts
9	1 neh-thalggu (BAM) or 1 astral hag (night hag* stats)*
10	Iron Shark is a Squid ship crewed by 1d3 hobgoblins, 2d4 goblins and a ssurran defiler (BAM) captain. They are fishing; or roll on Ships lvl 1-4
11	A ship adrift with no one alive on board or 1d4 vargouilles (MotM)
12	2d4 chwinga astronauts (BAM) on space guppies (BAM) or merrenoloth* (MotM) with a rowing boat*
13	1d2 astral killer whales or roll on Astral Sea Beasts
14	1d2 githyanki warriors or roll on Githyanki lvl 1-4
15	1 shipwrecked spirit (banshee stats) or 1d2 tridrones & 1d4 duodrones
16	Bladesinger is a Star Moth crewed by 1d6 scouts and a druid. The astral elf warrior captain is searching for a magic sword or roll on Ships lvl 1-4
17	1d3 psurlons (BAM) or roll on Aberrations lvl 1-4
18	1d4 astral swarms of quippers or roll on Astral Sea Beasts
19	1d3 pegasi or roll on Celestials lvl 1-4
20	1 starlight apparition (BAM) or 1 red slaad

Astral Sea (Levels 5-10)

d20	Astral Sea lvl 5-10
1-2	Spell Runner is a Flying Fish crewed by 2d4 giff shipmates (BAM) and a cambion merchant. They are smugglers; or roll on Ships lvl 5-10
3-4	1 mind flayer with 1d6 psurlons (BAM) or roll on Mind Flayers lvl 5-10
5-6	1d3 kindori (BAM) or an area filled with blue (or violet light). Moving mentally uses Wisdom (or Charisma) instead of Intelligence)
7-8	1 aartuk priest (BAM) and 2d4 aartuk warriors (BAM) or 1d2 green slaads
9-10	Magic Carpet is a Hammerhead decorated in hideous purple designs, with a and a crew of 2d6 space clowns (BAM) who have made a flesh golem the captain; or roll on Ships lvl 5-10
11	A ghost ship with a crew of ethereal figures who seek release or 1 psurlon leader* (BAM) with 2d4 psurlons (BAM)*
12	1 githyanki knight on a young red dragon or roll on Githyanki lvl 5-10
13	1d4 starlight apparitions (BAM) or roll on Celestials lvl 5-10
14	1 neogi void hunter (BAM) with 1d6 neogi pirates (BAM) or roll on Aberrations lvl 5-10
15	Cosmic Slime is a Turtle ship crewed by 3d6 plasmoid warriors (BAM), a priest and a plasmoid boss (BAM). or roll on Ships lvl 5-10
16	1 mercane (BAM) & 1d4 githyanki warrior guards or 1d2 braxats* (BAM)*
17	1 void scavver (BAM) or 1d2 hydroloths* (MotM)*
18	1 gray slaad in humanoid form or 1 morkoth* (MotM)*
19	1 reigar (BAM) with 1 esthetic (BAM) or roll on Ships lvl 5-10
20	1 zodar (BAM) or 1 archmage* using Astral Projection*

Astral Sea Encounter Details

1d20	They are... (or one is...)
1	drifting aimlessly with no goal in mind
2	following a shoal of astral fish or awakened (Int 10, speak Common)
3	following (or being followed by) something
4	investigating a weird glowing pool full of water weirds
5	near a mysterious runed obelisk (or a dead kindori)
6	pausing near a sleeping cosmic horror (BAM) (or a floating dead god)
7	surrounded by many harmless astral sea horses
8	frolicking merrily through the Astral Sea
9	investigating an empty spelljammer ship
10	near to a bizarre crystal structure (or a gargantuan glowing circle)
11	astral fishing or talking to a friendly mind flayer arcanist
12	looking for a portal to the Prime Material (or the Far Realm)
13	from a nearby astral dominion or trying to get help
14	being hunted by githyanki (or aberrations)
15	trying to avoid the attention of an astral dragon turtle (or astral dreadnought - MotM)
16	fleeing from something; or guarding a portal
17	watching over a nearby drifting dead god or hungry for conversation
18	heading towards a particular astral dominion or considering a complex problem
19	talking to an astral traveler or recently arrived through a portal
20	carrying a headband of intellect (or 1 scroll of create spelljamming helm - AAG)

Astral Sea Beasts (Levels 1-4)

d20	Astral Sea Beasts
1-2	3d6 space guppies (BAM) or 1d2 nightmares
3-4	2d4 gray scavvers (BAM) or 1d3 astral giant octopi
5-6	2d6 astral giant crabs or 1d2 vampiric mists* (MotM)*
7-8	1d6 space eels (BAM) or 1d4 astral giant seabirds (giant vulture* stats)*
9-10	1 brown scavver (BAM) or 1d6 astral hounds (blink dog* stats)*
11-12	1d2 astral killer whales or 1d4 psychic gray oozes
13-14	1d4 astral swarms of quippers or 3d6 astral dolphins* (MotM)*
15-16	1d3 astral wisps (will-o'-wisp stats) or 1d3 astral plesiosauruses
17-18	2d6 astral giant seahorses or 1d2 gibbering mouthers
19-20	1 night scavver (BAM) or 1 flail snail* (BAM)*