[Advanced Arsenal] Dimensional DoorKnob (Patreon)
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Wondrous item, rare
The dimensional doorknob is a must-have addition to the arsenal of any thief that lacks the necessary dexterity to pick locks themselves. In addition, the doorknob’s built in escape magic allows for a quick get away when things go south. As a guard wanders a museum of precious relics, bowels of a jail, or the vault of a treasury, they might find only unlocked doors and the telltale glowing purple light as a teleportation portal flickers into and out of existence.
Skeleton Key. As an action you can place the doorknob over a keyhole where, for the next minute, it attempts to pick the lock. The dimensional doorknob acts as a set of Thieves’ tools and automatically unlocks locks with a DC of 15 or lower. For higher difficulty locks, the doorknob has a +7 modifier to its Dexterity (Thieves’ tools) check.
Dortal. As an action while holding the doorknob, you can cast the dimension door spell. When you do so, a glowing purple portal appears in your space until the start of your next turn. Any creature up to 1 size larger than you can pass through the portal. After you activate this property, you can’t do so again until the following dawn.
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Uncommon variant: Remove the Dortal property and reduce Skeleton’s modifier to +5, and the DC of door that is automatically unlocked to 13.