@Aeseld
Rafina is inferior in title only on a techanility, in that the king of Belluga is God and the Duke rule's in his name. So for all practial purposes she's also a princess.
@CrazyYanmega What makes you think the shield can't interact with the terrain? Besides if you can interact with the terrain enough to collapse a cliff on her then her shield will diffintly be able to eat the boulders.
Charybdis had that negate magic and ultra-speed regeneration that meant Rimuru couldn't just eat it, The dragon didn't have them so Rimuru could just eat it and skip the fight entirety.