No Riven? - Use [Primed Pressure Point]

[Buzz Kill]

Slash Damage goes hard in arena

[Killing Blow]

Heavy attacks are slow, extra melee damage on heavy attack

Primed Smite Grineer?

Grineer enemies in the arena.. If you don't have primed use non-prime, its still better than attack speed or range, which are both not needed on top of [Berserker Fury], which should always be up

[Berserker Fury]

Attack Speed, its needed for the meta comp, which doesn't use [Wisp], if you have a [Wisp], drop it for [Corrupt Charge]

[Gladiator Might]

Crit damage is nice when you have 100% chance to crit

[Amalgam Organ Shatter]

More crit damage and more attack speed

[Amalgam Ripkas True Steel]

The only reason you're using a [Ripkas] over another heavy attacking slash build.. 100% gore chance on STRIPPED enemies. This is important, the wiki says you need to strip armor to proc gore, so make sure someone in your group is running Unairu's MAXED Caustic Strike, otherwise it's completely useless to run this, run a [Dokrahm] or any other heavy build, it'll be better

What do I need to roll on my Riven?

Crit Damage, Crit Chance, Damage, Grineer faction damage, in that order.

If you roll a GG Crit damage, crit chance, damage, and a curse mod, then drop [Smite Grineer] for [Primed Fury] and go crazy