Final-quest ending
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Finish Lacra's questline and start the ending from the objective in her quest Midnight Reckoning, by speaking to her.
Only what a source states. A short list is a short list, not a complete one.
quest
Complete Lacra's questline in order, ending at Midnight Reckoning.
character-alive
Lacra has to be alive and allied. Killing an NPC closes everything routed through them.
Read from this ending's own record rather than from the quests, because none of these advertises itself as an ending route while you are playing it.
1.A Friend Like This
Cost unknownAn alley in the north-east of Svartrau City, under the walls. It is the head of the Lacra and Osha chain, which ends in one of Bakir's Court activities.
2.Song of the Mountain
Cost unknownStarts by itself after A Friend Like This and leads to Uriash. The peaceful dialogue with the elder is what opens A Mother's Plea.
3.Hive and Seek
Cost unknownThe Uriash Matriarch, with Lacra. Third of the six quests that end in The Patricide.
4.Our Rotten Roots
Cost unknownFourth of Lacra's six quests, and the last mandatory one before her ending.
5.The Night of Horrors
Cost unknownMissableOptional within Lacra's chain, and the only quest on it with a trophy of its own — Misery Loves Company.
6.Midnight Reckoning
Cost unknownThe end of Lacra's chain, and an ending quest: its objective is what starts The Patricide.
The flavour text is verbatim, and on several endings it is the only published description there is.
The Patricide
silver“Defeat Brencis together with Lacra.”
Six quests of setup, five of them mandatory. This is what the side catalogue is actually for — the threads are the ending.
Brencis offers the turncoat bargain on this path too, as “I accept your offer. I'm sorry, Lacra”. Taking it abandons this ending at the last moment.
The Night of Horrors is reported as optional within the chain and awards its own trophy, Misery Loves Company. Whether the chain's earlier quests have their own time-sensitive objectives once started is not published — and A Mother's Plea, which sits inside the same Lacra and Osha material, is explicitly missable.