Contingent on the belief that a glyph of warding placed in a portable hole does not move even if the hole itself is moved, one can place a spell glyph that can be activated at a time in the future to provide a concentration-free buff to the activator. From a game mechanic perspective, I am uncertain what needs to take place to activate the glyph. Does one have to place the glyph on a wall inside the hole and jump in, touch the glyph, and then jump back out again? Can the glyph be placed on a 10' pole inside the hole so that the character only needs to reach in and touch the top of the pole to activate the glyph? The former would seem to entail use of the character's movement, while the latter might be a free action.
A Glyph of Warding is inscribed either upon a surface (such as a table or a section of floor or wall) or within an object that can be closed (such as a book, a scroll, or a treasure chest). A 10 foot pole is not an object that can be closed so not eligible, as for the portable hole it'd be up to the DM if any of it's surface is. Also, if the surface or object is moved more than 10 feet from where you cast this spell, the glyph is broken, and the spell ends without being triggered though so the glyph is still bound to the space where it was cast even if the surface or object can be moved thereafter.
As for trigger, you decide what triggers the glyph when you cast the spell. For glyphs inscribed on a surface, the most typical triggers include touching or standing on the glyph, removing another object covering the glyph, approaching within a certain distance of the glyph, or manipulating the object on which the glyph is inscribed. For glyphs inscribed within an object, the most common triggers include opening that object, approaching within a certain distance of the object, or seeing or reading the glyph. Once a glyph is triggered, this spell ends. You can further refine the trigger so the spell activates only under certain circumstances or according to physical characteristics (such as height or weight), creature kind (for example, the ward could be set to affect aberrations or drow), or alignment. You can also set conditions for creatures that don’t trigger the glyph, such as those who say a certain password.
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Contingent on the belief that a glyph of warding placed in a portable hole does not move even if the hole itself is moved, one can place a spell glyph that can be activated at a time in the future to provide a concentration-free buff to the activator. From a game mechanic perspective, I am uncertain what needs to take place to activate the glyph. Does one have to place the glyph on a wall inside the hole and jump in, touch the glyph, and then jump back out again? Can the glyph be placed on a 10' pole inside the hole so that the character only needs to reach in and touch the top of the pole to activate the glyph? The former would seem to entail use of the character's movement, while the latter might be a free action.
A Glyph of Warding is inscribed either upon a surface (such as a table or a section of floor or wall) or within an object that can be closed (such as a book, a scroll, or a treasure chest). A 10 foot pole is not an object that can be closed so not eligible, as for the portable hole it'd be up to the DM if any of it's surface is. Also, if the surface or object is moved more than 10 feet from where you cast this spell, the glyph is broken, and the spell ends without being triggered though so the glyph is still bound to the space where it was cast even if the surface or object can be moved thereafter.
As for trigger, you decide what triggers the glyph when you cast the spell. For glyphs inscribed on a surface, the most typical triggers include touching or standing on the glyph, removing another object covering the glyph, approaching within a certain distance of the glyph, or manipulating the object on which the glyph is inscribed. For glyphs inscribed within an object, the most common triggers include opening that object, approaching within a certain distance of the object, or seeing or reading the glyph. Once a glyph is triggered, this spell ends. You can further refine the trigger so the spell activates only under certain circumstances or according to physical characteristics (such as height or weight), creature kind (for example, the ward could be set to affect aberrations or drow), or alignment. You can also set conditions for creatures that don’t trigger the glyph, such as those who say a certain password.