Ezeket a csak Mandalóri (Mandalorian) sorozatban találták ki?

Ez nem az összes mandalórira vonatkozik.

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Ők egy durván vallásos szekta, akik betartják a szabályokat.

Magyarországon sokan keresztények, de nem tartják szigoruan a vallásos előírásokat.

A linkelt wiki szerint.

In the French version of The Mandalorian, Children of the Watch is translated as Les Héritiers de la Death Watch (The Heirs of the Death Watch).[6] Together with the fact that Djarin was raised as a foundling in the Tribe[1] after being rescued from a Separatist attack on Aq Vetina by Death Watch members,[7] and the fact that the Children of the Watch adhered to the Way of the Mandalore and other customs abandoned by the New Mandalorians,[2] this suggests that the Children of the Watch may be an offshoot of the Death Watch.

Ha megy az angol, nem forditanám, röviden, igen.

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The Children of the Watch are what Death Watch evolved into, with the group following the Way of the Mandalore even more strictly. The group also recruited people through adoption. They saved Din Djarin from the Separatists and in turn he became a foundling for the group. When the Empire came to Mandalore to wipe out its people, the group survived because they were on the Moon of Concordia. Since then, the Children have hid from sight and worked hard to remain more of a myth than a reality throughout much of the gal