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Message: <blockquote data-quote="Jack Simth" data-source="post: 2184596" data-attributes="member: 29252">The reason why you use Explosive Runes rather than Fire Trap or a Glyph of Warding:Explosive Runes has no material component.  Fire Traps are 25 gp each (gold dust, if I recall correctly).  A Glyph of Warding costs 200 (400 for the Greater version; Diamond dust).  You can put out a hundred Explosive Runes for the cost of however much time it takes to cast them, and can probably convince their effects to stack (although it's entierly possible that the GM will rule that only the first goes off, as it destroys the rest physically before they are up for dispelling, and that physical destruction of the media is not a listed means for triggering explosive runes).  Not many of the trap spells are both portable and lack material components.  Even fewer have a remote detonation mechanisim described in the spell itself - I suspect ER is the only such in Core.</blockquote>