Regalias:
Dawncaller, say yes to Mortimer on ch 2
Rosethorn, achieve A support between Samuel and either Christina or Theodore, whoever has the A support has to land the finishing blow on ch 14, or complete ch 27.
Galeshot, defeat Liam on ch 9 before turn 7, or kill Gabriel in ch 29.
Gladiolus, land the finishing blow on Alexander with Fred in ch 9 and 14 or defeat him in 29.
Starfall, Select Albert as your priest in ch9x, for that you need to talk with Hailey on the same chapter.
Lumina, Select Zakarias instead.
Ashcleaver, Kill Geoffrey in ch 11 or 29.
Voidflare, Kill Némesis on ch 24.
Hellblazer, Kill Alvaro on ch 27.
Arcgale, Kill Wester on 28 before turn 10 or William on  29.
Alastor, kill user on 29
Bolverk, Defeat or Recruit Galahad in 30.

PRF weapons:
Lucky Dagger, Jesse only, re-enter his cell on ch 13.
Moonblade, Thea Only,  joins with it.
Dagger, Thief Only, battle preps.
Stiletto, Thief Only, a chest on ch 13 and various stores.
Peshkatz, Thief Only, Colter and Thea A support and recruit Aubrey.
Dirge, Darkholm only and you get It by A supporting Emilia and Angelus or sending Ángelus away on ch 22x and recruiting Zahria.
Horfrost and Ice Spear, Windlance only, Shom and Shay join with the respective weapon.
Wind sword, Windlance only, kill a Falcoknight on ch 9
Levin Axe, Zakarias only, joins with it
Dire Thunder, House Rose only, Theo joins with one on ch 9 and you get another in ch 14.
Nightbringer, Albert Only, joins with it.
Daybreak, Dawn Only, Joins with it.
Leviathan, Halfdan Only, Joins with it.
Ragnarok, Axe form, defeat Tyronar with either Berit, Bjarki or Ralfnir and it becomes available to either of them.
Ragnarok, tome form, Defeat Tyronar with either Helga or Sigrid and It becomes theirs, both of these on ch 18.
Volsunga, Sigrid and Helga only, A support either with Halfdan.
Wyrmblade, Jaheira only, send her away on ch 16x.
Dragonstone Variants, Tendaris only, joins with them.
Ognuballi, Darius Only, defeat Kangax or whatever his name was. (edited)

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@VaeLis
Youngest sister is just lute with green hair
