The astrolabe Ring is quite an unusual tool, not only is it able to do everything an astrolabe can do but it is also a powerful tool for divination magic.
The ring properties are different depending on the time of the day.
Morning glory : During the hours of the morning, 6 am to 12am, the first spell of the day you cast, can use the following of those : The attack is cast with advantage, the save of the enemy has disadvantage, or you can cast it as an action instead of a minute.
High Noon : If the time is perfectly 12 o'clock, you can use the ring to cast a spell called High Noon.
Afternoon Delight : During the Afternoon 1pm to 5pm you gain the ability to cast good berries once, without expending a spell slot.
Evening Watch : from 6pm to 00am you gain darkvision 60ft and you have proficiency in perception.
Starwatcher : from 00am to 6am you can spend an hour studying the star charts, and the positions of the planet, gaining a chance to reroll 1 of your Divination dice the next morning.
Notes: Requires attunement by a wizard of divination focus.
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