Through Your Eyes

 For one minute, use the ink to draw a sigil on one creature with an Intelligence of 8 or higher while casting this spell. A mirror with the same sigil on it, which can be prepared in advance, will begin to relay what that creature perceives through their primary sense organ(s). Those who gaze upon the mirror will receive that information in the same manner it was perceived, which may be confusing, especially if the sense is not shared. For example, a target who uses tremorsense will likely not be intelligible to the average humanoid.

When cast a spell, this effect lasts until the next long rest. When cast as a one hour long ritual, the effect will last seven days. If cast with the explicit consent and participation of the target creature, it lasts as long as the mirror is unbroken or the creature survives, whichever comes first.

A document with the sigil made with the ink may be prepared as a ritual prior to the final casting. In this case, the target need only finish the document (such as by signing it or otherwise consciously agreeing to it), which takes an action. Such documents will last up to a year and a day from creation. If the ritual or casting is interrupted, the sigil fades, consuming the ink. If an extent sigil is used on a different mirror, both mirrors relay the information from the target. If an extent sigil is used on a new target, the spell ceases to be enacted on the previous target. At no time may any sigil be used on multiple targets.

In the event that this is relevant, such as in a Spelljammer setting, the information travels at the speed of light and may cross the boundaries of the ethereal or astral planes, but no other planar or universal boundaries.