Replace Sacrificial Steel and SpoiledStrike or BladeOfTruth with Blood Rush and GladiatorMight/BodyCount/GladiatorRush if you want to make use of combo stacking.

Landslide is 100% Impact damage, but damage types are inherited, so only the +165% Impact mod is worth considering.
If you'd rather have more Armor penetration than raw damage you could skip PTrauma for one of the mods mentioned above.

Arcane Avenger is an amazing damage increase for Landslide. Arcane [Fury] is also a solid one if you've got an empty slot.

Riven replaces PTrauma.
Riven stat priority: Dmg > Elemental > CC = CD
Impact can be good on a riven, but only for raw damage ofc.

Landslide does work with Status procs, but base SC is so incredibly low that it's pointless to build for.

Landslide Crit Viability Calculation
The calculations below use: PPP, Spoiled, 100%DmgSyndicateMod, PImpact, PTox, 90Ele.
2x90Elemental: 1.346 = (1+1.65+1+1)×(1+1.65+.9+.9+.9+1.65)/((1+1.65+1+1)×(1+1.65+.9+1.65))
SacSteel+OShat: 1.379 = (1+.05×(1+2.2)×(2×(1+.9)−1))/(1+.05×(2−1))
BloodRush+OShat: 1.672 = (1+.05×(1+4.4)×(2×(1+.9)−1))/(1+.05×(2−1))

Crit is viable even with just 5% CC. That's because the build is already so overloaded on Elemental/Impact damage, netting massive diminishing returns on more such mods.

Gladiator Might vs PTrauma/100%DmgSyndicate mod
The calculations below use: PPP, Spoiled, BR, OShat, PTox, 90Ele.
PTrauma+100%Dmg: 1.866 = (1+1.65+1+1)×(1+1.65+.9+1.65)/((1+1.65+1)×(1+1.65+.9))
PTrauma+Glad Might: 1.919 = (1+.05×(1+4.4+1.1)×(2×(1+.9+.6)−1))×(1+1.65+.9+1.65)/((1+.05×(1+4.4)×(2×(1+.9)−1))×(1+1.65+.9))
100%Dmg+Glad Might: 1.669 = (1+.05×(1+4.4+1.1)×(2×(1+.9+.6)−1))×(1+1.65+1+1)/((1+.05×(1+4.4)×(2×(1+.9)−1))×(1+1.65+1))