Re: Need an Advice.
Light for sure. If you are using the infinity on you merc you will need itens that has -XX% light resist for enimies. (Crescent Moon runeword, Griffons, Light Facets)
But you can also use the infinity yourself, the -55% light resist from it will make everythign easier, just make sure you reach the 117 BP (105 is enough for teleporting)
IT is up to you to go all vita with crazy lighning dmg or a Energyshield Nova sorc (both are really effective and will make everything you want to make, it can kill any monster in game, (not counting randon uniques and the light skellies from WSK LVL 3)