Black warlock

Black warlocks can be caught at 55 Hunter when you wield a butterfly net and have an empty Butterfly jar, yielding 270 Hunter experience. For catching Black warlocks barehanded (but still with an empty jar) you need 90 Hunter, this will grant you 1,200 Hunter experience. You can find Black warlocks in the jungle of Karamja.

You can release caught Black warlocks to get an empty jar again, this also grants you a combat boost.