What is the purpose of Support Gem: Trap?

Sunblast + reduced duration gem = instant trap detonation, btw. The traps will detonate as soon as they are set.

most people using traps stack crit damage, since no reflect is one of the main reasons to use traps over regular spells/attacks. otherwise, no real reason to go trapper imo, sadly enough.

this however means no leech which will make your toon very glassy on high level maps, but also very fun to play.

chin sol buff was huge for bow trappers, and puncture+trap in particular is used by many builds that arent even trappers, for single target

also what many people might not realize but multiple traps actually rolls crit per trap, as opposed to any projectile support like gmp or spell echo which is per attack/cast

so if you can trigger all 3 traps on same enemy, you can get away with low crit chance )but high crit damage) on trap builds that arent prolif.

Tri Elemental Trap is one of my Old build
Actually Spell Trap builds are very old...

Start as a templar and take only the pure elemental passives (no need for crit I think)
Take area radius near templar and witch and travel to show for +1 trap
And tavel to bottom most right for +2 traps

Choose acrobatics and high evasion shield around 1500 evasion in shield
get some EVS+ES gears and choose eldrich battery and mana regen

That's all you are ready to do ultimate trap damage with 9 traps at a time

Trap Ideas
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Trap + Cold Snap + Cold Panetration + Multiple Traps
Trap + Ice Nova + Cold Penetration + Multiple Traps
Trap + Storm Call + Lightning Penetration + Multiple Traps + Reduced Duration
Fire Trap + Fire Penetration + Increased Duration + Mutiple Traps
Lightning Trap + Lighning Penetration + Multiple Traps
+ one more trap skill combination to overcome the cooldown

may be "Iron Will" gem will boost more if you have 6L

This 6 trap skills allows you overcome the cooldown time and keep on throwing traps

atleast 250 mana regen per second and atleast 1500 mana in the pool then you are an OP :) :) :)

Good Luck :)

My Snapper Build