At the moment I think I have about 80% lightning damage and about 9 seconds cooldown on Akkarat's Champion due to 6 pieces of Akkhan.
As far I can see, I melt elites HORDES on IV (even if I solo them and have 3 others in my party afk). I did not test this built on V or higher. It does depend a bit of there is a lot of CC on the part of the elites.
I use FoTH with my Darklight and it really works wonders.
Shield Glare together with my built and The Final Witness is really nice too.
I swing my hammers for regular packs and perhaps spam FoTH aswell around the floor when Akkarat's Champion is active. When there is the 9 second cooldown, I don't use FoTH, it is way too expensive.
Anyone care to comment?