Build Guide
This is my take on the Helltooth set. As you can see we are not using SuWong diviner, but it's an amazing build. With permanent BBV Rain Dance with Kukri you gain 250 mana per sec, meaning you can spam Acid Cloud 24/7, and also, you don't have to sacrifice passives for mana management. On top of that we get the normal 20% attack speed bonus in the BBV ritual, for even more Acid Cloud Slow Burn that stacks. You don't need to use mana generating spells, and even though we use Pierce The Veil, we don't run out of mana! Your overall attack speed is great with kukri (in comparison with SuWong), and so all your skills attack faster, including fire wall. I prefere jinx over piranhado due to longer CC (12 seconds) and the extra damage they take is 15% more than Piranhado (30% more dmg in total). For the build to really shine, try getting an Ancient Kukri and go for maximum DPS on it.
One of the other great things about this build, is that with Thing of The Deep, we get the extra pickup radius, which will provide us with insane amounts of toughness from Swampland Attunement. Also Grave Injustice gives a lot more cooldown reduction when enemies within 40 yards die (with thing of the deep), which will greatly increase the amount of fire walls you can cast, along with all your other spells.
This build is optimized for HC, which is reflected in gems and so on.
I have cleared GR63 on solo HC. Viable for 65+ for good rifts.
Link to my hero for inspiration on items: http://eu.battle.net/d3/en/profile/lemmiwinks-2290/hero/46915925
I like it more than normal helltooth acid cloud with SuWong, but just my opinion. Check it out, see how it feels, and enjoy.
**UPDATE** 06/10/2015 - Cleared GR 64 solo on HC with this build in 12 min 18 s.
For group you change you gem "Molten Wildebeest's Gizzard" for "Bane of the sticken" ?
thanks