frostfire w/ shael or fire facets
+3 valor w/ 4 fire facets
focus or a 3soc helm w/ fire facets
cats eye or rising sun
treads
arachs
2x ama sojs or 2x dwarfs (sojs are probably better)
pury gloves
flavie arrows

Do not know how viable this build is but it should hit pretty hard. A merc with conviction would be icing on the cake.
The goal is massive fire damage.