Indeed that is the Dorudia tribe's mission, until the savior appears, it’s our duty to look after Holy Beast-sama."
"Wafun! (Now I found it Nya, this person's daughter is the saviour.)"
"Indeed, I guess that is the reason. But, this is unprecedented. To think that the savior's father is the one who summoned the Holy Beast-sama, and had him protect the baby..."
So it appears that inside Rinia's mind, the Holy Beast is using [wagahai] to refer to himself.
Somehow that’s made me remember about a certain muscular Demon King.