Innate Forma: 2x (1 Madurai and 1 Naramon)
Forma: 3x

[Glaive Prime] build for daily use (heavy attack)
*hold E and it'll release the [Glaive Prime] itself, then you could explode manually with middle scroll when it's reach the target you want
Replace Riven for Volatile Quick Return (it's work like Primed Firestorm/[Primed Fulmination], increase the radius of the explosion)
Best Riven stat: critical damage, critical chance, initial combo

Best to pair with: any, maybe [Ivara] Navigator (lol)
Best faction to encounter: Any

Q: Why Forma 3x?
A: Ok, simple explanation. I used this weapon too in Assassination mode, and mostly they're weak for 1 combined element. So you could change the element to match with enemy/Boss weakness (element 90). Then you could put faction Mod to replace Gladiator Might. So in the end it'll left 2 drain (2/74)

Q: Why Toxin?
A: U guys want Viral/Corrosive/Heat on Melee? primordial! go use Primer like [Epitaph], [Kompressa], [Kuva Nukor], or [Catabolyst]!. Ok, first it's Primed element Mod and then it's universal element especially when you encountered organic Corpus. So, no need to bother and use different element.