The best way to do this Trial is taking a friend and do Level Sync with him, preferred lvl of 13-14 but below can be done too, and then go to South Gustaberg at the Leaping Lizzy camp, those Rock Lizard got really low Hps 120hp maybe and you can do this quest really fast since there aren't too much ppl leveling low lvls now.

Have a good Trial ^^

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