Mercenary
Gemling LegionnaireThis build revolves around the new unique weapon 
Redemption and the 
Gemling Legionnaire quality stacking for 
Advanced Thaumaturgy. To fit to the "shotgun" theme of the build we using 
Cluster Grenade because the alt quality of this gem reduced detonation time.
Normally this skill would take 2 second to explode and spread the projectile (mini grenades) all over the place. But with enough reduction we can make this skill to instantly explode and make the skill look like we shooting with a shotgun.
Cluster Grenade explained
Without any thing the skill has 1 main projectiles and 18 mini grenades. With the support Multishot II + 
Run and Gun + explosive rythm (from weapon) we getting 5 extra projectile. 5+1=6 for the total 6 projectile. Now the mini grenades... 18*6 = 108 projectile and ALL can hit the same enemy. Easily hitting over 10 million with a single shot. This is enough to just one shot anything in the game.
Alt quality effects
The most important quality effect you can read below or in game pressing ALT
Cluster Grenade - Reduced detonation time
Flash Grenade - Extra damage as lightning
Herald of Ash - Global fire damage
Ghost Dance - +1 shroud stack
Oil Grenade - 15% less elemental resistance on the enemy
Explosive Grenade - Additional projectiles
Essence of Virtue Explained
Essence of Virtue is granting you maximum life, Armour, ES and EV and recovery. The more gem you have socketed the more effect you getting. Correspondingly to the gem colour. If you following my links you should have: 11 Red. 10 green and 4 blue. This means you getting 22% maximum life, 50% armour-evasion and energy shield. 24% life and mana recovery
Gem Studded explained
Gem Studded You getting bonuses based on support gem colours. If one of the is dominant you will get a bonus effect.
- Dexterity gems (green): 40% less movement speed penalty while using skills
- Intelligence gems (blue): 30 less mana cost
- Strenght gems (red): You cannot take critical damage from eneimes
If we making all colours equal then you getting ALL the bonuses. Just follow my links and you will not have any problem. In game you can check by pressing "G" and "support gem capacity" There is the total sum of the support gems.
IMPORTANT: You have two 
Grenade skill. This is coming from your weapon. You need to socket one blue gem and PAY ATTENTION you socketing to the correct thats is NOT grayed out. The game will still count it but you will not getting the bonus from it.
If you have Rigwald's Ferocity then you need to set your skills to SET 2! This way you will getting 30% more damage.
Redemption explained
Every 2 or 3 times when you use a grenade skill you gaining Explosive Rythm. This will give you Cooldown recovery rate for your grenades.
IMPORTANT
Buy a weapon with "Gain 1 explosive rythm every 2 times"
When you reach 10 stacks you will gain Explosive Fervour. ALL of your grenade skills will ignore the cooldown (you can just hold down your buttons) and you will gain attack speed and EXTRA projectile. Very important to use this time window (10 second) to one shot the pinnacle boss. Normal map bosses will die any way.
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