They are pretty weak, but if you want to kill someone in hell quickly, go with conviction-FoTH combo, and make sure you have +skills gear.

SET-UP:

Harlequin Crest
Skin of the Vipermagi (or Guardian Angel)
Herald of Zakarum
Mara's Kaleidoscope
Hand of the Blessed Light (+2 FoTH with +2 all pally)
War Travellers
Frostburns
Gloom's Trap
SOJ
SOJ
That makes +10 all, and +14 to FoTH, since Herald has +2 combat skills also. But if you want to, try out +2 pally valor with 'um'.