Using the heartswood core, you will be able to cast a spell at the summoning circle in the crypt below to open a portal for the succubus to pass through. Be careful, <name>, succubi have overrun even the strongest of minds. Once you have bested and returned it to the void, return to me and I will show you how to call and control it.
Sometimes I wonder if Surena was not a succubus in disguise, sent to warp and twist my mind... Ha! I give her too much credit, I think.
Well done, well done, <name>. I see we've done right in deciding to train you. Your performance certainly does not disappoint. I've no qualms in showing you the way to control your newly bound succubus. Observe carefully.