This Rafa Leveling Build focuses on using lots of corrosive damage to ramp up Rafa's melee and ranged capabilities. The bulk of the damage comes from 
Arc-Knives by layering in Corrosive from 
Altered Cabron and 
Galvanic Panic. These two will give us tankiness but also bursts of corrosive damage as well as movement speed.
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Rafa
Arc-Knives
CORROSIVE OVERLOAD Rafa Leveling Build
RafaLeveling
Arc-KnivesBuild Overview
Strengths And Weaknesses
- Corrosive Damage Powerhouse
- Extremely fast overdrive
- Heavy melee focused build
- Starts slower
- Big damage cascade at end game
- Sacrifices some of the cool ranged toys Rafa has
Skill Tree
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We'll be investing ALL of our points in Arc-Knives, but feel free to remove stuff that fits your playstyle better!
The trick here is to use Arc-Knives and have as much corrosive damage cascade from things such as:
El Borracho which will buff up Arc's Corrosive damage;
Blowout which will cause Corrosive explosions whenever we crit
Altered Cabron which will give us health, but also Corrosive explosions when we gain health namely lifesteal from 
Saldar;
Lastly, 
Midnight Oil will give us 5% MORE corrosive damage PER second of our Active skill being up. With 
Empuje we'll get 31 second up-time for Arc-Knives which should result in 155% more Corrosive Damage. I'm not smart enough to tell you how much more damage 
Cruel Accrual and El Borracho factors into that, but it's disgusting.
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