The Astrolabe Codex
A master wizard’s annotated codex holds the keys to a vanished observatory and the dangerous experiment that erased it from the stars.
Spellbook · Wizard, School of Abjuration · Level 17
The Astrolabe Codex
A master wizard’s annotated codex holds the keys to a vanished observatory and the dangerous experiment that erased it from the stars.
Ex librisIlyra VennWizard
At a glance
Level
17
Wizard, School of Abjuration
Spells
10
2 cantrips, 5 signature
Spell slots
1st level
2nd level
3rd level
4th level
5th level
6th level
7th level
8th level
9th level
At the table
A margin note
Plot hook
Spells
10 spellsCantrips
2- You hurl a mote of fire at a creature or object within range. On a hit, the target takes the spell's fire damage; a flammable object hit by the spell ignites if it isn't being worn or carried.
- Duration
- Instantaneous
- Target
- One creature or object
- Components
- V, S
- Save or attack
- Ranged spell attack
- Damage
- fire
- Higher levels
- Damage increases by at character levels 5, 11, and 17.
- Source
- Player's Handbook (2024)
- A spectral hand appears at a point within range. It can manipulate objects, open unlocked doors or containers, stow or retrieve items, and pour contents from a vial. It can't attack, activate magic items, or carry more than 10 pounds.
- Duration
- 1 minute
- Target
- A spectral hand at a point within range
- Components
- V, S
- Higher levels
- No scaling.
- Source
- Player's Handbook (2024)
1st level
2- Until the start of your next turn, you gain a bonus to AC, including against the triggering attack, and take no damage from Magic Missile.
- Duration
- 1 round
- Target
- Self
- Components
- V, S
- Higher levels
- No scaling.
- Source
- Player's Handbook (2024)
- For the duration, you sense the presence of magic within 30 feet. You can take the Magic action to see a faint aura around a visible creature or object bearing magic and learn its school, if any.
- Duration
- Concentration, up to 10 minutes
- Target
- Self, sensing magic within 30 feet
- Components
- V, S
- Higher levels
- No scaling.
- Source
- Player's Handbook (2024)
3rd level
1- You attempt to interrupt a creature in the process of casting a spell. The target makes a Constitution saving throw; on a failed save, the spell dissipates with no effect.
- Duration
- Instantaneous
- Target
- One creature casting a spell within range
- Components
- S
- Save or attack
- The target makes a Constitution saving throw; the spell fails on a failed save.
- Higher levels
- When cast with a spell slot of 4th level or higher, the interrupted spell has a penalty on its saving throw equal to the slot's level minus 3.
- Source
- Player's Handbook (2024)
5th level
1- You create an invisible wall of force at a point within range. It can be a free-floating sphere, hemisphere, or flat surface within the spell's size limits. Nothing can physically pass through it; it is immune to damage and can't be dispelled by Dispel Magic.
- Duration
- Concentration, up to 10 minutes
- Target
- A point within range where the wall appears
- Components
- V, S, M (a pinch of powder made from a clear gemstone)
- Higher levels
- No scaling.
- Source
- Player's Handbook (2024)
6th level
1- A thin green ray targets one creature, object, or creation of magical force. A creature makes a Dexterity saving throw, taking the spell's force damage on a failed save or half as much on a successful one. A creature reduced to 0 Hit Points by this damage is disintegrated.
- Duration
- Instantaneous
- Target
- One creature, object, or creation of magical force
- Components
- V, S, M (a lodestone and a pinch of dust)
- Save or attack
- Dexterity saving throw
- Damage
- force
- Higher levels
- The damage increases by for each spell slot level above 6th.
- Source
- Player's Handbook (2024)
7th level
1- An invisible, immobile force prison appears around an area within range, in cage or solid-box form. Creatures completely inside are trapped; a creature inside can't leave by nonmagical means.
- Duration
- Concentration, up to 1 hour
- Target
- An area within range, shaped as a cage up to 20 feet on a side or a solid box up to 10 feet on a side
- Components
- V, S, M (ruby dust worth 1,500+ GP, which the spell consumes)
- Higher levels
- No scaling.
- Source
- Player's Handbook (2024)
8th level
1- You banish one creature you can see within range to a labyrinthine demiplane. The target can take an action to try to escape by making a Intelligence check; on a success, it escapes, and the spell ends.
- Duration
- Concentration, up to 1 minute
- Target
- One creature you can see within range
- Components
- V
- Higher levels
- No scaling.
- Source
- Player's Handbook (2024)
9th level
1- Wish can duplicate any spell of level 8 or lower without meeting its requirements, or produce another effect within the spell's stated limits. Using it for an effect other than duplicating a spell can impose severe stress and may prevent you from casting Wish again.
- Duration
- Instantaneous
- Target
- Varies by chosen effect
- Components
- V
- Higher levels
- No scaling.
- Source
- Player's Handbook (2024)
In the margins
3 notes
WarningThe third ring is not a planet. Do not align it with the moon again.
DiaryIf the ward answers in my mother’s voice, close the book and leave the tower.
FormulaForce is not absence. It is a boundary given conviction.
The book itself
The ink smells faintly of rain on hot stone.
Its diagrams rearrange themselves into constellations at midnight.
Several pages are carefully patched with vellum from an older, burned spellbook.
The caster
WizardIlyra Venn
Studies: Abjuration and the geometry of magical boundariesManner: Precise and courteous, she treats conversation like a lecture and dislikes being interrupted during calculations.Focus: A brass astrolabe whose central needle points toward the nearest active magical effect.Quirk: She taps the brass astrolabe twice before making any consequential decision.Wants: Find the observatory’s vanished archive before the celestial alignment that caused its disappearance returns.Ilyra Venn was an observatory apprentice who survived the disappearance of her master and the tower they studied in. She has spent decades cataloguing the event’s magical residue.
The book
A midnight-blue codex bound in brass, with pages that turn themselves toward the reader and fine silver diagrams that shift when viewed from different angles. Its clasp is a miniature astrolabe.
Its wards · GM only
About the book
FormatBrass-clasped arcane codex
ThemeArcane
Written by aWizard, School of Abjuration
Caster level17
SystemDungeons & Dragons 5th Edition (2024)
Plot hooks
1The codex’s shifting star chart reveals the location of the observatory, which appears only during a rare conjunction.
2A rival scholar claims the book contains the final proof needed to restore a lost city, but one of its wards recognizes the rival as an intruder.
3One page has been cut out cleanly. Its matching diagram has begun appearing in the dreams of people who have never seen the book.
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