In the time that the remaining warriors had arrived, Shiro had asked the warrior with a wind divinity to shred up some trees which he wasn't too bothered by since they were waiting around doing nothing for a few days.
Just to be safe, Shiro had asked the dryad for any trees that she could cut down. While she was a little sad that a few trees were going to die for this operation, it was ok since having the dread sapling survive was much worse than cutting down a few trees.
With the dryad's permission, Shiro had the warrior shred up enough trees so that they could completely surround the tree with wood dust.
Explaining the plan to the warriors along with a small demonstration, they were ok with opening the fight with the dust explosion so that they didn't harm their allies. After all, if they were to attempt this during the fight, it'll be akin to throwing a bomb into a crowd of allies.
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