Whise Courier

You magically mark yourself and one willing creature you touch. The mark is invisible except to detect magic. The spell ends early if either creature dies. Once per day, each marked creature may use an action to summon a phantom messenger owl, which appears in an unoccupied space within 5 feet of them. The summoner may place a written message or a small non-magical object weighing up to 1 pound into the owl’s spectral talons. The owl immediately flies toward the other marked creature unerringly knowing the most direct route, and arrives in a d8 hours for every 100 miles of distance between the two marked creatures. You can't summon a phantom messenger owl if it hasn't yet delivered your message. If the target is on a different plane, the owl disappears, and what he is carrying falls to the ground. The owl can pass through nonmagical barriers no thicker than ½ inch, is immune to damage, cannot be restrained, and cannot interact with anything except the message it carries and the marked creatures. Casting this spell, if you are already marked, end the spell early.