How to get to the Deep Sea Hidden Dragon in QQ free fantasy?

You found wanzo. Yuancang machine: the first step is to synthesize night spirit beads. You go to the suburb of Fenghai to kill some octopus balls and ratchet turtles, and get 10 from them and give it to me. You gave the fragment of the night spirit bead to the immortal Yuan. Yuan Cang Ji: Night Spirit Beads have been synthesized. Now go to Yuelongtan to kill several deep-sea baby dragons, seal monsters and turtle monsters, and find 12 elf crystals from them to synthesize elf lingshi. You gave the fairy crystal to the fairy Yuan. Yuan Cang Ji: Still need to synthesize glass core. It's hard. First, you go to Coral Hill to kill several mussels, octopus monsters and puffed fish, and look for three pieces of coloured glaze stone. You gave coloured glaze stone to Yuan. Yuancangji: Now, I want you to go to Coral Mountain to kill a deep-sea hidden dragon and bring its soul to me. You killed the deep-sea hidden dragon and gave your soul to Yuan. Yuan Cang Ji: Not yet. I'll inform Elder Turtle first, and then come to me in a few days. I'll tell you everything.