Portal Alarm

2nd-level abjuration (ritual)

Casting Time: 1 minute

Range: 30 feet

Components: V, S, M (a tiny bell)

Duration: 24 hours

Classes: bard, cleric, sorcerer, wizard

You create a magical warning each time a Tiny or larger creature passes through a gate, teleportation circle, or similar magical portal that transports creatures to another location or plane. You can designate creatures that do not trigger the portal alarm and can choose whether the warning it gives is audible or purely mental. An audible alarm sounds like a small bell ringing for 10 seconds, while a mental alarm rings only in your mind and reaches you even if you are up to 1 mile away, awakening you if you are asleep. At Higher Levels. If you cast this spell using a spell slot of 3rd level, the portal alarm lasts for up to 7 days and you can choose to create an audible or mental alarm or both.

If you cast it using a 4th-level spell slot, you gain the benefits above and you also can designate another creature to receive the mental alarm rather than you. In addition, you (or your designated creature) receive a mental picture of all creatures that have passed through the portal as if you were standing within 10 feet of the portal alarm, including which direction they passed through it.