The Dragon Guard
A floating brain in a jar. Not much more to be said.
Martin is not able to fight.
Martin was an Eladrin scholar. He attempted to join a religious group, so as to learn more about them, but instead wound up at a temple to an evil deity. This led to his becoming a Brain in a Jar. Fortunately, Malygos was able to resurrect his body, and Arthur put his mind back in it. Now he travels with the Dragon Guard in hopes of learning about the inevitable curiosities they come across.