Conjuration build?
I’m sure ppl tried that and result was bad. Charge system, 1 minute cooldown and almost no synergy from traits. For effective using conjured weapons need system, similar to engineer’s kits.
A Lightning Hammer Ele is considered the most powerful PvE build by some.
Basically it’s 20 points in fire for 10 more charges and 5 points in Water for constant Regeneration. The other two utility skills are used to protect you until you can blind your foes with the Hammer.
More detailed guides:
http://www.guildwars2guru.com/topic/65884-the-ultimate-40-elementalist-levelingfarming-build-cantriphammer-build-highest-dps-innate-survivability/
http://www.guildwars2guru.com/topic/57471-conjure-lightning-hammer-build-discussion-thread/