Sisters of Parvos
This page explains what you need to do, to get a Sister of Parvos and how to beat her.
Creation
Choose your progenitor (Warframe that determines the element of the weapon) and I would recommend Xoris for this task. Do Granum void, nightmare difficulty (insert Zenith granum crown), rank 1 (kill 25+ Specters) on any corpus ship tileset. After you exit the Granum void, Vala will announce that a Candidate has spawned. Kill and confront it and if it isn’t the weapon you want, you can extract and the weapon you didn’t want will be taken out of the drop table (List of weapons that can spawn) and won’t appear at all until every weapon is taken out of the table, which resets the table and all weapons are back. Sisters of Parvos also have a 20% chance of spawning with an ephemera.
Lure your sister out (this sounds weird)
Do Sister controlled nodes, indicated by the node covered in a blue surface. Unlike Kuva Liches, where you kill Kuva Thralls to charge your murmur, you kill hounds. They spawn less compared to Thralls, but they give more murmur. Defeating them opens them for mercy kill and when killed, they will fill up your murmur and your sister’s rage meter.
Sister controlled planet
Image from Steams Play's Sisters of Parvos guide
Downed Hound
The rage meter determines the chance of your sister appearing during a sister controlled mission. The angrier your sister is, the higher the chance she will spawn during a mission. She will always spawn with a hound and spawn rate of hounds is higher. When you finish any mission in a sister controlled planet, you have to pay taxes, where she will take about 90% of your credits. They will be returned when you defeat your sister.
When the murmur is filled up, it will reveal a requiem mod that you need, to defeat your Sister. there are 3 murmurs and each require more thralls than the previous murmur.
Empty murmur
Full murmur
Revealed mod
Requiem mods
They’re parazon mods and can be obtained through requiem relics, that can be obtained as a reward from Kuva Siphon or dropped from Kuva Thralls/Hounds. Crack the relics in requiem fissures. Every Req mods have 3 charges. If the mod is out of charges, you can transmute 4 empty req mods to get one charged req mod. One charge will be consumed, when the sequence of your Lich is correct. Every Lich has a random sequence and if the mod is on the wrong slot, your lich will rank up and move to the next planet. Enemies will get harder a well as your Lich. Equip your req mods on you parazon and on the left side, it shows you, what mods you have unlocked and which slots were correct/wrong. It is also shown on the Liches profile.
On the right side are usually the requiem mods
Confrontation
If your sequence is correct, your sister will flee to Pluto Proxima (Railjack mission). During the mission, destroy corpus ships, Turrets and enter the big ship. Confront your sister and defeat the specters first, then her hound and then your sister. When your sister is defeated, you have 2 options: Convert or Vanquish.
Convert:
Turns your sister into an ally. You won’t get the weapon, but you will get the ephemera, she will appear in missions to help you when you die once and you can recruit them as Railjack crewmember.
Vanquish:
You kill your sister and will get her weapon and her Hound.
Downed Sister