Those Who Wear Many Faces, Tanks volume 4

From publisher blurb:

Everything has a role, and these ones are tanks, but ones who wear aren't always who or what they appear.

In this you will find 3 characters with backstories full of fluff and build guides to help you create them at any level from 1 to 20 as a character or NPC in your game.

Nam Goodman, a halfling with double life and a royal problem.
Dr. Iain Cavanagh, a human body theif who is searching for the lost bits of his humanity.
Quon Treeskipperh, a grippli smuggler who saves lives.

At the end is a new artifact to use, the Prismatic Nexus Ioun Stone, a powerful device here to judge te worthiness of it's users.