This build will solo shiro way faster then a sin and doesn't use 3 heroes so you can take more people. However it does use Devona.

Eye of the North PvE only Mindbender 24 1 5 Enchantment Spell. For 6..16 seconds, you move 20..33% faster and your Spells take half as long to cast. (Attrib: Asura rank) Prophecies PvE only Magnetic Aura 60 ¼ 5 Enchantment Spell. For 5..20 seconds, Magnetic Aura has a 75% chance to block melee attacks. (Attrib: Earth Magic) Core PvE only Armor of Earth 15 ¾ 10 Enchantment Spell. For 30 seconds, you gain 24..60 armor, but move 50..14% slower. (Attrib: Earth Magic) Eye of the North PvE only Ebon Battle Standard of Honor 20 1 10 Ward Spell. You plant an Ebon Battle Standard of Honor at your current location. For 10..20 seconds, non-Spirit allies in this area strike for +5..15 damage and an additional +5..10 vs. Charr. (Attrib: Ebon Vanguard rank) Factions PvE only Sliver Armor 30 1 10 Enchantment Spell. For 5..11 seconds, you have 25..50% chance to block attacks and whenever you are the target of a hostile Spell or attack one nearby foe is struck for 5..35 earth damage. (Attrib: Earth Magic) Core PvE only Arcane Echo 20 2 15 Enchantment Spell. If you cast a Spell in the next 20 seconds, Arcane Echo is replaced with that Spell for 20 seconds. Arcane Echo ends prematurely if you use a non-Spell skill. Core PvE only Echo 10 1 5 Elite Enchantment Spell. For 30 seconds, Echo is replaced with the next Skill you use. Echo acts as this Skill for 30 seconds.

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Celestial Storm for last spot

Attributes
Earth Magic: 12+1+3(can be 1 to)
Energy Storage: 12+1

Armor:
Survivor or Radient would be best. Any would work though

Weapons:
+20% enchant staff or sword will work best.

Usage:
Start the mission and get celestial skill. Run to cutscene and skip the cinematic. If you took anyone with you make them run onto the platform past the bridge. Run right up so Shiro is just outside aggro bubble. Cast 1,2,3,4,5 and wand him. Then use Arcane echo to echo echo. Then use cele skill. Use the echoed version of echo and reuse cele skill. Then use the 3rd cele skill. If the bound warrior(devona will get banished) ran away wand him back. When it dies use the three celestial skills again. Now 6 are falling down on shiro and he is owned. You will probably need to recast your ward and magnetic aura.

Thanks for posting this. I've never actually tried to solo Shiro myself. Might have to give this build a try.

does it work in HM? if so, ima run ppl for money. nice build too

It does. Sometimes I fail with it though.

Might I also suggest dropping out Mindbender for BUH!?

seen it work...nice

If there is only one player within range, the hench will get banished. That's why it's important to get everyone else to go to the platform on the right before engaging shiro.