superstition
First Post
The issue, if one exists, is that the first paragraph or thesis of the spell states that it's used to cast harmful effects but then the body of the spell description allows for interpretation as it mentions loading spells into a glyph that effect a target creature or area.
So were I to read this like a writing instructor I'd limit glyph of warding to things that could cause a harmful effect on a target creature or area, but if I was reading this like a DM that wants his players to think outside of boxes to be cool, I'd allow anything that affects a target creature or area, knowing that the majority of spells would be harmful but that some would just be creative.
In my own games I'd not allow the use of a glyph of warding to hold a beneficial effect, nor allow the glyph to be portable in any way, but that's just me.
PHB said:“When you cast this spell, you inscribe a glyph that harms other creatures, 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) to conceal the glyph.”
• That wording clearly states that the glyph must be harmful. There is also nothing in the wording that supports a prohibition on portability. It even specifically gives two options that are readily portable (books and scrolls).
• The "other creatures" part also specifies that the glyph is harmful to all creatures other than the caster.
• "To conceal the glyph" implies that the spell should be used in a manner where the other creatures are unaware of its presence.
The glyph has been given errata for the 6th edition. It no longer needs to be harmful:
6th Printing Errata said:Glyph of Warding (p. 245). The first sentence clarifies that the magical effect needn’t be harmful. The final two sentences of the first paragraph now read as follows: “The glyph can cover an area no larger than 10 feet in diameter. 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” (6th printing).
The spell should be renamed due to this change. Warding implies "warding off". One does not ward things off by being neutral or positive toward them.