Find Gavel the Temperant in the Temple of Solusek Ro.
Hail, Gavel the The Temperant
Gavel the Temperant says "May the fires of Solusek Ro warm your innards! I am Gavel the Temperant. I work with sister Blaize to forge the most elegant finery for clerics known to man or beast. Because we have no need for material wealth here in the temple, we ask that you retrieve [ingots and icons] from the lost or fallen brothers and sisters of our order. When mixed with some enchanted, [galvanized], [vulcanized], or [magnetized] platinum into an alloy, the items I can forge are splendid indeed!'
Say or click "ingots and icons"
Gavel the Temperant says "The ingots and icons are all named after the virtues of the cleric who held them. The virtues I require are those of the [reverant], the [constant], and the [devout]."
Say or click "constant"
Gavel the Temperant says "Althuryn the Constant was brutally slain by two aqua goblins. The one called Sludge fled to Runnyeye, the one called Dwigus lives in Dagnor's Cauldron. Bring me the ingot of the Constant, the icon of the Constant and 2 galvanized platinum bars and I will forge them into a reward for you."
Dwigus Lowater is a wandering mob in Dagnor's Cauldron.
Sludge Dankmire is a static mob at the bottom of Runnyeye. You need to swim to the end of the slugde river and you will see an underwater passageway. Sludge is located at the end of that passageway.
Take 2 enchanted platinum bars to Genni in Temple of Solusek Ro and she will return 2 galvanized platinum bars.
Turn in all four items to Gavel.
Gavel the Temperant says "Wear this with pride!"
You receive the Chestplate of the Constant.