Archspire (5e Spell)
| 10th-level Conjuration | |
| Casting time: | 3 Days |
|---|---|
| Range: | 1 Mile |
| Components: | V, S M (a tiny replica of the structure to be created, forged from adamantine and ironwood, and a seed of any massive tree species, both of which are consumed by the spell) |
| Duration: | Instantaneous |
| Casters: | 3 |
You conjure forth a magniloquent structure, a testament to your magic. The structure's height can be up to 5 miles (above or below ground, or split between) and can be up to 1,000 feet wide, but otherwise its appearance and broader makeup is up to you.
The structure can't be destroyed by any spell of 9th level or lower; however, it can be wished away to a different plane for up to 24 hours, or if it is targeted by an imprisonment spell and fails (the caster with the highest Wisdom saving throw makes the save), all of its entrances and exits lock for the duration and no creature can teleport in or out of it.
The structure has 25 AC, 1,500 hit points, and a damage threshold of 50 (making it immune to any single damage dealt that is below 50). While it stands, the structure recognizes a single ruler, allies, and any others the casters designate. The casters designate a ruler while casting the spell. If the ruler is killed or otherwise defeated, the structure recognizes the victor as the new ruler. The ruler can teleport or plane shift the structure to a new location over the course of 1 hour using a map that has the new location on it. The ruler can additionally teleport themselves to any other location in the structure as an action if they haven't been damaged in the last minute. The ruler and the allies can teleport to the structure from anywhere on the plane it resides over the course of 1 minute. Allies of the structure include the other casters of the spell (which can't be changed) and any other creature that the ruler designates. If the ruler changes, previously designated creatures cease to be allies.
The ruler is aware of all creatures within the structure and their precise location. They can also create creatures while within the structure as an action, of a type you decide when casting the spell (except humanoid) which can be up to CR 5. The total CR of creatures still active and created by the ruler can't exceed 150.
Additionally, the structure emanates an aura 10 miles in every direction (10-mile-radius sphere) This aura is tied to the type of creature chosen for the structure. An undead aura causes plagues and blights, a celestial aura causes bountiful harvest and beautiful creatures. Work with your DM to determine these effects. If the structure moves, the aura takes 7 days to assert and grow over the new land. The aura always suffuses the inside of the structure, and the ruler only ages one second for every day that passes in it.
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