The puzzle door in snow veil sanctum originally shows two birds and one snake (Two nightingales + a traitor) : r/skyrim
Snow Veil Sanctum | Elder Scrolls | Fandom
Mercer Frey won't open Snow Veil Sanctum? Fus Ro Dah him down the stairs then push him to where Lydia is standing. That spot contains a trigger which will activate the next
Snow Veil Sanctum - The Elder Scrolls V: Skyrim Wiki Guide - IGN
Snow Veil Sanctum Key - Special Edition at Skyrim Special Edition Nexus - Mods and Community