Reguarding Cleric Plane of Sky Quest

[Frytard]

in this link:
http://wiki.project1999.org/Cleric_Plane_of_Sky_Tests

It says, "You say, 'I wish to trade'

Deric Lennox says 'Bring me Theurgist or a Truwian Baton and I will upgrade them to something a bit more useful."

What does it mean or what does he give when he says he will upgrade them to something more useful?

Thanks