The tool is a weapon at same time Throw it and it will always return as long there still is velocity/power left It can pick up stuff that is breakable by hand (like no use by tools) and mobs/drops that have 10hp or less. Players (or mobs that have more then 10 hp) will be damaged.
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Mese can break more stuff, more times at same throw, and can break stuff like stone / ores, makes a flash when hit something
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Wood cant pick up stuff, less damage, fails if it hit something else then air & leaves.