Puro-Puro is the choice spot to hunt implings as you are guaranteed to see large numbers of them at any given time. The most effective strategy involves snaring the target impling with a bind spell then catching it while it is rendered immobile. The bind spell can only be cast when next to the target unless you are wielding a mainhand magic weapon. This will require you to swap to a staff/wand to snare then back to your net to catch the impling. To keep the rarer implings spawning, be sure to catch all implings that are higher-level than nature implings, including nature implings themselves.