Mercenary
Gemling LegionnaireThis build revolves around 
Armour Piercing Rounds and the 
Gemling Legionnaire quality stacking for 
Advanced Thaumaturgy. To fit to the "machine gun" theme of the build we usingArmour Piercing Rounds because the alt quality of this gem is giving you more attack speed. Making our character shoot a lot of projectile under a second. This is also breaks the enemy armour which is very usefull because this build is physical based.
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Armour piercing rounds explained
This is our main clear skill and it is very usefull for single target as well. Or you can just use only this skill for clear and single target if you prefer that playstyle. The clear is getting solved with Chain. You either using Chain III or using the desecrated modifier "attacks chains additional time". Doesn't matter which one you choosing you will Dominus' Grasp for more chain!
How to get the mod
This mod is exclusive for abyss desecrated mods. This is a suffix and can be targeted with ulaman omen. You need an open suffix and your weapon don't have a desecrated mod in prefix.
IMPORTANT! This can be skipped if you fine with the damage penalty on Chain III support gem. If you just want experiment with the build it will be super fine without the mod!
The steps is the following
Get crossbow with open suffix / full suffixes. All tho if you don't have a desecrated mod in the suffix it could remove your good suffixes such as + to projectile levels (if this is just +3 then don't worry you can add back with essence)
Use omens: Omen of the Sovereign‌, Omen of Dextral Necromancy‌ then just desecrate your weapon. Use omen of echos for another chance. There is a very big chance you will hit the chain additinal time.
You hit it! If you don't have yet a + levels to projectiles. Now its time to use the Perfect battle essence. This will remove a random mod (at this point you should have full prefix and suffixes) There is a 66% chance it will not remove your crafted mod. If it removed the desecrated mod you need to redo the desecrated steps! This is costing basically nothing.
You missed the desecrated mod. Well you can try two things!
- If you dont have the +to projectile skills or + to attack skills you can try to add and maybe you will remove the desecrated mod. This has only 33% chance. If you removed the mod than you try again the desecrated steps
- This option will cost a lot of currency! Omen of light and remove the desecrated mod. Then try again.
Sadly even if you hit the mod and you don't have the +to attacks or projectile mod on your crossbow you will need to try you luck add it with Perfect battle essence. 66% chance to win.
The ideal start is your weapon already has the + attack / proj skills and have a "bricked" desecrated mod. So you can just omen of light off and do till you hit the mod.
I suggesting this steps only if you have a very good crossbow!
Alt quality effects
The most important quality effect you can read below or in game pressing ALT
Armour Piercing Rounds - More attack speed
High Velocity Rounds - More physical damage
Ghost Dance - +1 shroud stack
Berserk - Maximum rage
Emergency Reload - More damage during effect
Berserk and Eternal rage explained
First: 
Eternal Rage must be come from the new amulet base 
Absent Amulet. Otherwise we could not fit in! This will give us by default 30 rage which is 30% more damage! Now with the Berserk and the quality this will provide us 98% MORE DAMAGE. Yes this combo will give us that much. Now you see why we want this amulet base!
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: 13 Red. 12 green and 4 blue. This means you getting 26% maximum life, 60% 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.
