Mastering ninth-level magic in fifth edition tabletop roleplaying requires looking past standard combat damage and examining absolute control. Among these high-tier tools, the Imprisonment spell stands out as the ultimate instrument for permanent containment, narrative isolation, and campaign-shifting villain disposal. Whether you're a wizard seeking to lock away an archlich or a Dungeon Master designing an airtight plot device, understanding the precise mechanics of capture, containment, and escape changes how you view high-level encounters.
This breakdown cuts through ambiguity to explain how the spell functions mechanically, what material costs you'll face, how the six containment options operate, and what options characters actually have when facing or breaking this magic.
Core Mechanics and Casting Requirements
Casting Imprisonment demands meticulous preparation. It isn't a snap decision made in the middle of a chaotic skirmish; it requires a full one-minute casting time. Because of this duration, you must maintain concentration throughout the entire minute while someone keeps the target restrained, distracted, or otherwise unable to disrupt you.
The target must be a creature you can see within 30 feet. Upon completion of the casting, the target makes a Wisdom saving throw. If they succeed, they resist the magic completely, and they become permanently immune to that caster's attempts to use the spell on them again. If they fail, they are locked away until the conditions for release are met.
The material components are exceptionally costly and specific:
- A vellum depiction or a carved statuette in the likeness of the target.
- A special component tied to the chosen version of the spell.
- Both components must be worth at least 500 gp per Hit Die of the target. For a massive 20 Hit Die creature, that's a baseline requirement of 10,000 gold pieces just in raw materials, making repeat castings a severe economic hurdle.
While affected, the creature doesn't need to breathe, eat, or drink, and aging ceases entirely. Divination magic cannot perceive or locate them, rendering them entirely off the radar for standard tracking spells like locate creature or scrying.
The Six Forms of Containment
When you cast the spell, you select one of six distinct confinement types. Each variation changes the physical nature of the prison and dictates a unique secondary material component.
Burial
The target is entombed deep beneath the earth inside a hollow sphere of magical force sized precisely to hold them. Nothing passes through this barrier from the outside, and the captive cannot escape using teleportation or planar travel. The required special component for this version is a small mithral orb.
Chaining
Heavy, unbreakable chains erupt from the ground, binding the target firmly in place. The creature suffers the restrained condition and cannot be moved by any physical or magical means whatsoever until the spell ends. This version requires a fine chain made of precious metal.
Hedged Prison
The spell banishes the target into a custom-built demiplane. This pocket dimension can take the shape of a labyrinth, a sprawling tower, a cage, or any other confined structure. The demiplane is heavily warded against all forms of teleportation and planar travel. The special component is a large, transparent gemstone, such as a ruby or diamond, which cannot be broken while the spell remains active.
Minimus Containment
The target shrinks down to a height of one inch and is sealed inside an indestructible gemstone, amulet, or similar small object. Light passes through the object so the miniature prisoner can see out, but matter, energy, and spells cannot cross the boundary. The vessel itself acts as the special component.
Slumber
The target falls into a magical, unshakeable sleep and cannot be awakened by any standard physical or magical stimuli. The required special component for this version consists of rare soporific herbs.
Breaking Free: Termination and Escape Routes
Because this is a ninth-level spell, normal countermeasures fail. You cannot simply throw a standard dispel magic at the prisoner. Breaking it via dispel magic requires the caster to use a ninth-level spell slot and target either the prison itself or the physical special component used during the initial casting.
Every casting requires the caster to specify a precise trigger condition that will automatically end the spell. Rules state this trigger must be an observable action with a realistic likelihood of occurring within a decade, such as a specific person offering a prayer at a designated altar or a particular monster meeting its end.
Furthermore, using a specific special component links it to a single active prison. If a caster uses that exact same component to imprison a new target, the original occupant is immediately freed from their binding.
For deeper tactical reference on high-level spellcasting mechanics and spell components, consult the rules available on D&D Beyond. For alternative third-party high-level rule interpretations, the A5E System Reference Document provides additional perspective on high-tier magic.
Common Mistakes and Rules Misinterpretations
Even experienced tables trip over specific interactions regarding high-level containment.
- Ignoring the casting time: Trying to cast this as a reaction or a standard one-action spell in combat violates the one-minute requirement. You need total control of the environment or cooperative allies to protect your concentration.
- Miscalculating material costs: Forgetting to scale the gold cost based on the target's Hit Dice breaks game economy balance. A high-level monster requires thousands of gp per casting.
- Assuming divination works: Players often assume high-level wizards can locate a missing ally trapped in a gemstone. The spell explicitly blocks all divination tracking, making rescue missions purely investigative rather than magical.
Frequently Asked Questions
Can you kill a creature while it's affected by Imprisonment?
It depends on the containment form. In Minimus Containment or Hedged Prison, the physical body is sealed inside an indestructible object or warded demiplane, making direct attacks impossible. Under Chaining or Burial, physical damage might theoretically reach them depending on DM ruling, though their biological needs cease entirely.
What happens if the special component is destroyed?
If the gemstone or special component is indestructible by the text of the spell (such as in Hedged Prison), it cannot be smashed. If a component can be damaged and is destroyed, check specific DM adjudication, though standard procedure relies on the designated release trigger or a 9th-level dispel magic.
Can a creature use innate teleportation to escape Hedged Prison?
No. The demiplane and alternate confinement forms are explicitly warded against teleportation and planar travel, stopping escape methods like misty step or gate.
How do legendary resistances interact with the spell?
Legendary creatures can expend a legendary resistance to automatically succeed on the initial Wisdom saving throw. Smart spellcasters always force the target to burn through their resistances using lesser control spells before attempting this prolonged ritual.
