I Carried My Sister's Bastards, Then Raised Ancient Sacred Beasts

Moon elf Ella's sister steals her blessing and dumps every child she conceives into Ella's womb, while her dragon-king husband kills the newborns as bastards. Dying on Crown Peak, she wakes the day the World Tree granted their gifts. This time she will protect the children she lost and raise the sacred beasts that crown her Mother of All Beasts.