Spell Sink

From Wayfinder's Guide to Eberron, page 119.

Description
Eldritch machine, legendary.

This device creates an Antimagic Field that covers a three-mile radius around the spell sink. The form that it takes will depend on the nature of its creator. The Ashbound druids despise unnatural magic, and if they create a spell sink it will be a living artifact — a twisted tree that consumes the mystical energies around it. Conversely, a mad artificer would create a massive vessel of dragonshards and exotic metals. It might be that the sole purpose of the device is to negate magic, or it could be that it is absorbing all magical energies in the area and storing that power for a cataclysmic effect!