Core/Auth: Updated AuthResult enum
Script/Spell: Apply Shadow's Fate to Sindragosa

Sindgragosa is summoned in instance script and would not pass the modified check otherwise

Related to: #9487
DB/SAI: add SAI for The Light's Mercy

Closes #9364
DB/Creature: add a text on death for Overmaster Pyron

Closes #9267
DB/Creature: add missing Silver Convenant in Frozen Halls

Closes #9082
Merge remote-tracking branch 'upstream/master'