Build this one up and then swap to grenades around level 20 or so.
It deals cold damage and freezes enemies while sending the Ranger backwards.
Gas Grenade
Gas Grenade is the other pivotal skill in our setup.

This fires a bouncing grenade that inflicts poison damage and leaves behind a poison cloud.
Hit ‘em with your Explosive Shot and watch them ignite.
Ball Lightning is a powerful projectile that fires off lightning bolts at all foes within range.

Alternately, you could also use it to teleport into the projectiles that Ball Lightning sends out.
This will make a noticeable difference when it comes to defeating bosses quickly and increasing your Ranger’s survivability.
This is a vital gem that works great with Lightning Arrow but also with Explosive Shot.

I use it in the early game to make Lightning Rod more effective; you should too.
Encumbrance
Use this with Oil Grenade and Wind Dancer.
Overcharge
Stick the Overcharge support gem in Lightning Warp as soon as you’re able.
This will increase the magnitude of Lightning Warp’s shocks by 75% in exchange for a shorter duration.
The tradeoff is worth it in my eyes for greater electrical power.
Arcane Tempo
Last but certainly not least is Arcane Tempo, which lets you cast spells faster.
That’s all we’ve got on the best ranger build; now get out there and start shooting!