EARTH DOME was a Base Grade Spell, but since it was a top Base Grade one, it could even handle attacks equal to Master Grade Spells. That was, of course, if they were at the low-level Master Grade Spells.
Jathurth's attacks could be considered over that level, but that didn't mean that Earth Dome would break just by one hit.
As Shingi started focusing on breaking the sphere, the EARTH DOME shook as something impacted it. Dust fell over Shingi as part of it broke, but not enough to make a hole.
Shingi fed his Spell with Earth Element to repair it, but since he couldn't focus entirely on it, the rate was relatively slow. Fortunately, he wasn't alone, and the rest outside tried to make Jathurth concentrate his attacks on them instead of Shingi.
As Shingi once more made another attack with his Spirit Element to break the sphere, it bounced back, having no effect.