Farm.

You drag her to a clearing in the deepwoods. The fact that the entire forest is really dark making this small light look like a spotlight. Now, under the sun, you feel your own mana regenerating.

You place her on the ground again and root yourself over her body, just like before, but this time you that care not to suffocate the priestess. Using the same rock from before, you hit your own hand and, after successfuly resisting the urge to scream, watch as your precious, poisonous sap slowly leaks from your wound. You allow it to leak in a small hole on the ground before your bleeding stops. You spit a dart on the ground, the suddenness even makes the priestess jump, but you ignore it. You take the dart and dip it in the poison before returning to the priestess.

"What are you doing? You're weird. I've seen millions of enemies of all kinds. Some of them killed some of my friends, even myself, but none of them had leveled up or done... THIS! You're supposed to stay in your place and wait for your time to die. That's your purpose!" For a priestess, you're kinda dumb. That's not a smart thing to say to your captor, you know. "My ca-what? You're just lucky! My friends will see I didn't return, they'll come here, and when they do, you'll die! Just like any other dandelion we've stomped before..." I don't like your attitude, Priestess. Look, I'll go easy on you and your friends if you apologize You say slowly, knowing that she will refuse "HA! As if I would apologize to an overgrown patch of grass like yourself! Know your place, plant, or I'll have to weed your s-" not wanting to waste any more time, you suddenly stick the dart on her neck, and the poison immediately takes effect. You know that your poison causes 2hp/s and that you can heal 2hp/s. Combinating both skills, and the fact that you're regenerating mana under the sun, you begin repeatedly killing and reviving the priestess.

For the duration of your poison, you hear another soft Ding! for EVERY second. After the poison effect passes, you don't waste any time before repeating the proccess again and again and again...