No Riven, big hammer boy
[Kuva Shildeg] is a fairly new melee hammer. It comes with very high critical stats and a very high status chance.
Mods
Berserker and [Quickening]: Its a hammer so naturally its pretty slow, both these mods fix that. If you have [Valkyr] [War] Cryor other warframe abilites that increase attack speed, you can replace [Quickening] with something else.
[Condition Overload]: Main damage mod.
[Blood Rush] and [Organ Shatter]: Your bread and butter crit mods.
[Drifting Contact] and [Weeping Wounds]: Boost that status chance. The status chance will [Reach] 100% once the [Weeping Wounds] gets going.
[Primed Fever Strike]: You need an element to take advantage of the other mods in the build. Also combos with whatever element you get innately on it, mine came with shock so I get corrosive, but this also works with gas or viral.
Alternatives
Non-Primed versions: Pretty self explanatory, if you don't have the primes you can just use the normal versions.
Weeping Wounds: If you don't have Weeping Wounds, you can replace the status mods with the dual-stat counterparts.([Virulent Scourge] and [Vicious Frost])
Bloodrush: If you don't have Bloodrush, you can use [True Steel].
[Condition Overload]: If you don't have [Condition Overload], you can use [Primed Pressure Point] or normal [Pressure Point] instead.
Warframes that buff attack speed: As mentioned above, if you are using warframes that can buff your attack speed, you can replace [Quickening] with a different mod of your choice.