I usually use that build for grineer Void Fissures

[Icy Avalanche] gives you 100% Armor Reduction , 6 ces CC and 150 Damage Absobtion per enemy hit. Altrough Damage Absobtion doesn't help in direct tanking it's useful in knockdown immunity (scew you knockdown) and protection against Status Effects. And yeah it's passes through walls.

[Total Eclipse] gives Quad Damage in day form and Damage and Accuracy Reduction in night form for all team in 35m

So after full armor removal you could finish off survivig grineer with Eclipse + AoE weapons

But most wacky stuff happens during Void Fissures when you get Reactant Buff for 2x multiplier to Ability Strength and Ability Range (seems Shatter damage goes bonkers).