Warning: I am not a veteran in game (mr15) though I dare say I have enough experience to make this guide.

[Prisma Obex] is an all rounded weapon with high crit chance, high crit status and decent crit damage. The only downside is the range of this sparring is too damn short. Nevertheless, it is still a monster even without riven.

What you can expect - constant red crits (when melee combo fully stacked), armor [Shred], SATISFACTION FROM RED NUMBERS AND PUNCHES.

Mod replacement recommendations

1. Attack speed. Many may slap on a Berserker or [Quickening]. For me that was no longer needed since I will use a frame with Helminth Warcry from subsumed Valkyr.

2. Combo Duration - Naramon Focus is a reliable method as always, but you can use mods to compensate the absence of Naramon, especially for people like me who runs Zenurik every single game for Energy Regen.

3. Organ Shatter - Free Mod Slot
   I use [Organ Shatter] because I don't have better mods. However you can slap on anything that you think is worth, ranging from riven to an impact mod (jokes aside tho, please don't slap IPS mods, not worth).

Personally I do not substitute [Gladiator Might] for something else because the crit chance from Gladiator effect allow the [Prisma Obex] to have over 200% Crit Chance, hence the consistent red crits. However, [Helios]'s [Deconstructor] can contain the mod and apply the effect to your [Prisma Obex]

4. [Primed Fever Strike] is most welcomed, I don't have it therefore I did not put it. The forma on [Fever Strike] slot should keep the mod capacity within limits.

5. For Endurance runs, Primed Smite Mods is recommended. However, unless you really like the weapon like I do, you should use another weapon realistically speaking.

6. Elements - If you have armor [Shred], use viral. Else, corrosive or magnetic when vs Grineer or Corpus. You can also use gas on Corpus and Infested.

7. Augment ([Entropy Detonation]) is a great mod, but personally I dislike ground finishers. The syndicate effect of restoring energy is definitely worth when you have Nara on as your focus school.

8. Only use [Primed Reach]. [Reach] itself is a trash mod and its primed variant is just so much better. Sparring weapons absolutely need the range so hitting enemies won't be a pain in the ***.

9. Stances does not matter. I use [Brutal Tide] because of the default Naramon polarity, and it does feel nice.

Finally, I hope that you enjoyed this monstrous weapon.