When you cast this spell, you draw a rune on a surface (such as a table, floor, wall, etc.) or an object that can be closed to hide the rune (such as a book, scroll, treasure chest, etc.) that is not necessarily harmful to the creature.
Glyph of Warding 5e
Classes: Bard, Wizard, Cleric
Casting Time: 1 hour
Components: V, S, M
Duration: Until dispelled
If you specify a surface, the rune can cover an area up to 10 feet in diameter inside. If an object or surface is removed more than 10 feet from where the spell was cast, its rune is destroyed and the spell is terminated without triggering.
Boundary runes are nearly invisible, and require an Intelligence (Investigation) check with the spell’s immunity DC to be detected.
You set the Boundary Charm’s trigger conditions when you cast the spell. The most typical triggers for a rune carved on a surface are: touching or standing on the rune, removing an object covering the rune, getting within a certain casting distance of the rune, manipulating an object on which the rune is located, and so on.
Typical trigger conditions for a rune carved inside an object include: opening the object, getting within a certain distance of the object, seeing or reading the rune, etc. Once the rune is triggered, the rune is triggered. Once the rune is triggered, the spell is terminated.
You can further refine the trigger conditions, such as setting a spell to trigger with specific conditions, or setting its trigger to have a specific physical characteristic (height, weight, etc.), a specific creature type (e.g., setting it to affect only monsters or zords), or a specific camp. You can also exclude people with certain conditions from the rune’s trigger, such as someone who speaks a certain password.
When carving a rune, you can choose between Explosive Runes and Spell Runes.
When a rune is triggered, it will explode with magical energy within a 20-foot sphere, spreading around corners. Each creature in the area must make one Agility Immunity. Those who fail the immunity take 5d8 damage from acid, cold, fire, lightning, or thunder (which you specify when making the rune); if you succeed, the damage is halved.
You may cast a prepared spell of 3 rings or lower ring level and reserve it in the created rune. The reserve spell must target a creature or an area, and it does not take effect immediately when cast in that manner. The rune will then cast the stockpiled spell when it is triggered.
If the spell points at a target, it targets the creature that triggered the rune; if the spell affects an area, the area is centered on that creature; if the spell summons a hostile creature or creates an object or trap of a damaging nature, the creature will manifest itself where it may be near the trigger and attack it. If the spell requires focus, its effects last for its maximum duration.
When casting the spell using a spell bit of 4 rings or higher, the damage of a blast rune increases by 1d8 for each ring you use that is higher than 3. If you create a spell rune, its reserve spell can have the same ring level as the spell bit you used when casting the guard inscription.