Allagan Tomestone of Astronomy
“Though they appear to be naught more than simple stones, Garlond Ironworks engineers insist they contain reams of invaluable information on the sea of stars gathered by the lost Allagan Empire.
— In-game description

Allagan Tomestone of Astronomy was a type of Allagan Tomestone introduced in patch 6.05. They dropped from level 90 dungeons, trials or raids. They could not drop before the player's class is at level 90. You could not spend them before completing Endwalker.
Allagan Tomestones of Astronomy were discontinued in Patch 6.4. They could be exchanged with Auriana in Revenant's Toll (X:22.7 Y:6.7) for Allagan Tomestone of Causality until patch 7.0, when they were removed altogether.
- Players could carry a maximum of 2,000 Allagan Tomestones of Astronomy.
- Players could only receive Allagan Tomestones of Astronomy after reaching level 90 with at least one class or job.
- Speak with Cihanti in Radz-at-Han (X:10.8 Y:10.4) to exchange Allagan Tomestones of Astronomy.
- Speak with Khaldeen in Radz-at-Han (X:10.8 Y:10.4) to enhance gear received in exchange for Allagan Tomestones of Astronomy.
Uses
Allagan Tomestone of Astronomy were used to purchase Item Level 590 gear in Radz-at-Han. They could be used to purchase:
Others
| Item | Type | Price |
|---|---|---|
| Manderium Meteorite | Miscellany | |
| Complementary Chondrite | Miscellany | |
| Crucible Rain | Other | |
| Dharmic Rain | Other | |
| Thavnairian Almandine | Stone | |
| Vanadinite | Stone | |
| Alchemical Abrasive | Stone | |
| Palebloom Kudzu Cloth | Cloth | |
| Thavnairian Thread | Cloth | |
| Titanoboa Skin | Leather | |
| Amynodon Hide | Leather | |
| Hannish Varnish | Reagent | |
| Palaka Mistletoe | Reagent | |
| Thavnairian Horsetail | Reagent | |
| Alchemical Charcoal | Reagent |