What happens when I use Drawmij's Instant Summons on Dimensional Shackles?

Question

If I place an enemy or individual in a set of dimensional shackles (I've already placed instant summons on the shackles), and I summon the shackles to me, what happens?

As I read the description of the spell and the shackles, I notice a few things:

• The individual can't teleport away from the shackles.
• The individual must go where the shackles go.
• The shackles must answer the summon because they are in my use, not in the use of some other individual.

So, would this combo:

• Create some sort of hiccup in time/space?
• Rip the shackled individual's limbs from its body?
• Teleport the individual to my location?

Answer 1

The outcome is ambiguous, ask your GM

Drawmij's instant summons specifies:

If another creature is holding or carrying the item, crushing the sapphire doesn't transport the item to you, but instead you learn who the creature possessing the object is and roughly where that creature is located at that moment.

You'll have to ask your GM if the shackles binding a creature count as "holding or carrying". If they do the shackles won't teleport based on the clause.

If your GM decides that being bound by shackles is not the same as holding or carrying then the shackles will teleport, unbinding the creature. Nothing about Drawmij's instant summons would bring the creature bound by the item along with it, and dimensional shackles don't prevent the shackles themselves from teleportation.