Aiwë's words and beats echo in her mind, giving her focus, however. She weaves another spell into a radiant arrow and fires it. "Centaur! Let nothing block your path!" The arrow streaks through the air towards the stone wall, then becomes a charging Centaur. It raises a hammer and swings as it crashes into it, sending it exploding into chunks and bits that fly around and dissipate into stardust. (Dispel Magic with Bard Inspiration. The Wall of Stone is gone.)
Auroth the Ice Snake darts forward lunging at the mage in another attempt to constrict him. It's powerful body crushes through his magical shield and it starts to drag him back into the silence. (Daerevorn takes 16 bludgeoning damage and is grappled and restrained. Escape DC 16)
The centaur then crashes into Daerevorn dealing a radiant blow. His shield seems like it's about to hold, but Stella focuses more of her energy into it, allowing it pierce through just barely. (He takes 11 radiant damage. Unless the DM rules that my bonus action can't be taken after the snake's attack, which would be perfectly fair.)
Stella (13 / 32 HP, 14 AC)
Auroth (60 / 60 HP, 12 AC)
Rolls
Dispel Magic Wisdom Check vs Wall of Stone (DC 15) - (1d20+4)
(10) + 4 = 14
Auroth Attack - (1d20+6, 2d8+4)
1d20+6 : (18) + 6 = 24
2d8+4 : (48) + 4 = 16
Starry Form Archer Attack - (1d20+7, 1d8+4)
1d20+7 : (12) + 7 = 19
1d8+4 : (7) + 4 = 11
Starry Form Archer Attack Adv. (from Restrained) - (1d20+7)
(16) + 7 = 23
Straining to hit him past the half cover from Koveras. Wild Magic Surge! - (1d100)
(89) = 89