A large spew of flames surprised the group in the empire throne room as Tierk appeared in front of everypony. As he brushed himself off Luna and Cadence got into defensive stances and lit their horns. “Tierk! I suggest you surrender immediately before we blast you back to Tartarus!” Cadence said preparing to fire. Tierk looked at the two alicorns before waving a hand at them. “I'm not here to fight and absorb your magic princesses.” Tierk said surprising the two “I heard about what you have been doing and thought about a suitable compromise to our problems.”

“And that is….”

“Reverse my castration and I'll give you intel on where your little blue friend is.” Tierk said shocking Cadence and Luna. The two looked at each other before looking back at the large centaur. “What do you think you earn in this? And how do we know you won't try to absorb our magic again?” Luna said flying up to face Tierk. The giant simply scoffed and shooed Luna away from his face.

“I want my ability to reproduce again and enjoy myself. I know I'm the only one if my kind but I've been able to enjoy myself very nicely, or even ask a larger dragon for assistance.” The mares shuddered at the thought of what Tierk was saying “In return I will leave Equestria and give you intel on where that pony you seek is.” The two alicorns thought about it until Cadence spoke up.

“How exactly did you get out of Tartarus? I thought Twilight removed your magic when she banished you?” Tierk laughed at the two's confusion. “Celestia of course. She makes frequent visits the land and I absorb slight amounts of magic and regain my strength. I was able to escape back to here again. And I'm assuming your blue pony is in Tartarus somewhere and Celestia is visiting him. If you return my balls I'll assist you in retrieving him before my leave. Take it or leave it.”

The two alicorns thought about it for awhile while Tierk tapped his hooves on the crystal floor. Eventually the princesses made their decision and turned to face him. “What do we need to do?”

In Tartarus

Groaning I looked over and saw Celestia still sleeping with her hooves wrapped around me. One of the mares injected another paralysis drug into me then walked away to check something. I laid my head back down on Celestia's barrel just waiting for another wake up when I felt myself being lifted. I saw myself wrapped in a dark aura and was levitated away from the table. Looking around I was surprised to see Tierk floating me in his magic and smiling. “Magical rescue. Courtesy of Luna and Cadence.” I then noticed the AGO badge on his chest and grinned behind my muzzle. I made a muffled noise and darted my eyes towards the vats.

Tierk getting my clue looked at the vats as well and quickly knocked out the mares with his magic. “I'm guessing you either want me to destroy or take the tanks with us yes?” making a muffle sound of approval Tierk grasped the vats with magic and soon all disappeared from the room. “They are all in the Crystal Empire waiting for you. Now let us leave before cake ass wakes up.” he said before we disappeared. We then appeared back in the empire throne room as I was unbounded and unmuzzled but couldn't stand due to the drugs.

“It's good to be home….”

Author's Notes:

So that puts the griffons, yaks, dragons, majority of Equestria, three of the four princesses (excluding Flurry), the elements, Thorax, Discord, and Tierk.

All I need is Chrysalis