See the accompanying build here for use specifics. Replace Primed mods with their regular counterparts if unowned, although this will make consistent oneshots for Rank 4 and 5 Liches impossible, especially if they Resist Corrosive or Cold. Replace Cleanse mod according to faction (Corpus if facing Sister). Replace [Chilling Reload] with [Blaze] if your Lich is weak to Blast, or with a Riven if owned.
If a Lich has especially problematic Resistances (e.g. Resists both Corrosive and Cold), it may be worth swapping elements to match their weaknesses; though keep in mind that Shields and Ferrite Armor have an innate 50% Cold and 75% Corrosive weakness respectively, and that Resistances apply an additive -50% effectiveness, while Immunities apply an additive -75% effectiveness, on top of these weaknesses. Experiment at your own discretion.
Also usable as a conventional [Kuva Hek] build.