just before the last wipe I crafted a set of holy chainmail for my templar. it had 5 connected sockets. I put in Ice Spear + spell totem + greater multiple projectiles + cold to fire conversion + elemental proliferation
the result was I could raise a totem that would shoot 5 ice spears every half second. the ice spears would chill/freeze enemies and set them on fire for a nice DoT. any enemies that got close to the frozen & burning foes would get chilled and burned also.
the mana cost was insane but the totems did all the work. it actually saves mana when you attach spell totem support gem because the totem will just keep on casting the spells repeatedly.