[2.3] Blast Avatar, Marauder's Crit Blast Rain, Core/Uber Labyrinth Done

Blast Rain is a Bow skill released by 2.1 Talisman patch.

It looks like the spell 'Firestorm' except 4 random located but target-centered AOE explosion occurs when the projectiles land. They always overlap targeted area!
It has a decent coverage, and because the explosion overlaps, it's also very powerful againsts single target.

Templar test run Video:
Test Run - The Dried Lake
Test Run - lv77 Merveil kill

Simple way is tool-tip dps x (4+0.75) hits(Helmet enhancement) x 1.54(penetration),
So if I have 20K tool-tip dps, it will be 146K, nice right? but this is assuming the monster stand still and take all the blasts. Usually...monsters move, xD.
Because of the delay of blasts, you should predict monsters' movements and attack slightly ahead of their direction. With 'Increased Area of Effect' support gem it doesn't matter that much but I still recommend to do so. When you link only 'Concentrated Effect' to Blast Rain, the AOE coverage is no bigger than a coin, you want every attack perform the maximum damage, so it would be better if you could develop it a habit.
example, attack 1 and 2, then you go.

Character in Perandus league:

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lv20 Blast Rain, lv19 PPAD, lv20 WED
lv13 Q20 Faster Attack and Fire Penetration
5L DPS with Hatred, HoA, Ice Golem and Blood Rage

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6L DPS with 'Concentrated Effect' support, lv13 Q20.

1. It's physical based pure elemental damage build.
Convert 50% physical damage to fire damage by Avatar of Fire. With another 50% damage conversion from the skill itself, Blast Rain now do pure fire damage.

About Damage conversion see here

2. Use Lioneye's Fall to transform melee skill node to bow's.



3. Defence:
Acrobatics + Life regeneration + leech + 'CWDT - Immortal call with Endurance charges'.
Leech life and mana from attack damage .

Stack life leech rate with master craft gloves and amulet to make leech recovery faster.
for example


4. 'Pyre' is an option, you can play this build without it, but it's strongly recommended

It converts all cold damage to fire damage which makes 'Hatred' more effective. It also increase burning damage.
And the last affix works just like 'Shatter'. It grants the ability that destroy ignited enemies, thus prevents some on-death effects by monsters that could cause further damage.
About 'Freeze and Shatter' see here.

5. Enhancements by Ascendancy
a). Chieftain Ascendancy Skills
Fire damage / penetration / increased damage against burning enemies.
Fire damage leech, life regeneration, chance to gain Endurance charges.


b). Additional blast chance by Helmet Enhancement
for example

75% chance to have +1 blast (1 blast= 1/4 total dmg per attack, that's average 18.75% more dps.)

Pros:
-With 'Hinekora, Death's Fury' by Chieftain Ascendancy skills, Lava_Lash(8% penetration in 2.2), Forces of Nature(6% penetration in 2.2) and Fire Penetration Support Gem(38% at lv21) we should have max 62% fire penetration! Rapid clear speed with 'Increased Area of Effect', great DPS with 'Concentrated Effect' for boss fight.
-Decent survivability with Acrobatics, Fair life regeneration rate. 6.7% (+1.5% if 3 Endurance charge) at lv78.
And 3% life fast leech without support gem.
-Remote elemental AOE attack, slight delay, solid hits, clear packs at safe distance. I like it. xD

Cons:
-We don't have VP, no instant leech, so Elemental damage Reflection could be serious danger even we have 80% fire resistance with purity of fire.
-Poor Jewel sockets in skill tree.
-Lack of DEX and INT. Either Harbinger Bow or Assassin Bow requires 212 dex to equip with. Need find some on gears or use Fluid Motion to convert some strength to dex.

Start with Marauder
Bandits:
Normal help Oak/ Cruel kill all/ Merciless kill all.

Jewels:

lv55 68points, Trials of Ascendancy in Normal finished
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lv68 Avatar of Fire, Trials of Ascendancy in Cruel finished, 'Hinekora, Death's Fury' located
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lv78 with Acrobatics. Trials of Ascendancy in Merciless finished, 'Ramako, Sun's Light' located
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lv90
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lv91, current
Depends on what gear you use:
'Point Blank' is 1 point away, take it if your gears aren't good enough to fast clear.
You could drop 'Forces of nature' for more life if you have trouble getting 4000 life.

Current gears




Kaom's Heart is the goal once I have a 6L bow.
Fire damage and 500 life! love it.
If you want to focus on AOE coverage and dps Carcass Jack might be an option for you.

5L/6L Blast Rain
General set balanced for both clear speed and boss fight:

Gem order by priority, about Penetration see here
If 5L, switch between 'Increased Area of Effect' and 'Concentrated Effect' for clear speed or higher DPS for boss fight.

If you want more dps with 6L, PPAD is an option, though you need to consider socket colour changing.

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4L #1 CWDT set.

This set separate you and melee attackers also block projectiles from ranged monsters after you take damage and trigger 'Frost Wall'.
'Immortal Call' gives over 0.6s physical invulnerability with 'Increased Duration', it'll last longer if we have 'Endurance Charge'(which we get often from critical strike. xD), it's a very effective defense method.
When it comes to party, 'Frost Wall' is annoying. Here's some option:

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4L #2 Aura / Buff / Movement

Extra cold damage from 'Hatred' will be converted to fire damage by 'Pyre'.
Besides extra fire damage, HoA ignites 130%+ overkill dmg to nearby enemies, you'll find out monsters out of BR AoE could just burned down by HoA.
You could make it more efficient by swapping different Golem to suit variety situations.
For example:

For quick healing when run Labyrinth.


More survivability while fighting boss.

If you take 'Point Blank' (which is 1 point away when lv78), you could use Curse Aura instead of HoA to significant improve dps to close/middle range enemies.


Other On-demand option

Try get a RBGW 4L for this set, easy swap purity of elements(fire/ice/lightning) means better adaptability.
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4L #3 Vaal Grace / Vaal Haste / Blood Rage.

This build has enough life regen to cover the 4% degeneration of 'Blood Rage'.
Though we don't do physical damage, therefore no extra leech for us, it's still a strong buff with increased attack speed and chance to gain 'Frenzy Charge'. It refresh its duration while we clear mobs, so usually we just cast 'Blood Rage' at the beginning.
Both Vaal Grace and Vaal Haste take advantage of increased duration support. They offer Great Dodge chance and boost DPS / movement speed to a higher level for 10 seconds.
Vaal Grace
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Concept of Juggernaut version is to gain maximum Endurance charges frequently, with 'CWDT + Immortal Call' set

triggers physical damage invulnerability.

lv92 Juggernaut tree
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DPS with Concentrated Support.

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Physical damage reduction with 7 endurance charges.

lv91 skill tree.
Skill tree Picture version, in case tree link change.
Character status

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Switch for boss fight

5L DPS

Twinned Abyss cleared, check the map mods

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You'd better get 'War Binger' before run Uber Labyrinth

Change you flask, use 'Basalt Flask + Granite Flask' in set.


Be aware of 'statues of elements', they grant Izaro elemental damage and chance to cause ailments. shock/freeze could simply get you killed.
More info about Izaro