Undetectable shrines in Zelda BotW that are not heroic missions

I'm trying to find all shrines in Zelda BotW and I was wondering if there is any shrine that is both unable to be detected by the Sheika sensor and is not a Heroic quest. I'm referring, for instance, to Tho Kayu Shrine, which is not part of any quest but only appears after you kill the Moldora and light four torches.

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1 Answer

Saas Ko'sah Shrine qualify I think. I'm not aware of any quest for it, although if I remember correcly, there's a character that give a hint about it in a stable.

It is located

in Hyrule Castle, dock access

and can be found by

lighting the big brazier on the upper platform.

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