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"Here!" The chief gave the children MP Potions to keep conjuring magic, the two held the Grimoire together to conjure Magic from within it at the same time, a little trick that Acorn discovered and then taught them to do.
"Fireball! Fireball!"
"Lightning Strike!"
B O O O M!
B O O O M!
ZAAAAAP!
The Treants that were rushing towards them were blown to pieces and engulfed in flames, but there were hundreds of such monsters approaching, all while the Giant Miasmic Treants that used to be the tallest trees holding their houses looked from afar with malicious smiles, awaiting their demise.
B O O O O O M M M!!!
A Fire Bomb that the Chief created was thrown into the distance, exploding and blowing into bits more Treants, but this couldn't keep but for much longer, once he ran out of bombs, it would be game over for all of them.