Delson Mier

You've never heard of Delson Mier? He's the guy who wrote the book on extraplanar travel!

Delson Mier is a Newlandic explorer and eccentric who is most famous for his Traveler's Handbook of the Planes, considered the authoritative travel guide for planar explorers. Mier himself is an experienced explorer of the planes and has visited several of them. In the modern day, he is retired and lives a peaceful and quiet life in Shortrest, Newland.