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Green Powder
This green powder comes in a nice red silky bag. The old druids of earth created it for battle purposes while restoring the old growth.
All you have to do is pour all the powder on the ground and a big tree will appear in front of the on going attacker who might find him/herself with a broken nose. It can also block any energy attack.
The tree will stay there, but I don't think you'll be hiding behind a tree the whole time