Bob_Says_Hello_Stars , and others, there is a place that Isaac and the Miraclins (Aurora, Davis and Chloe [just came up with Miraclins, it means Miracolo Haven's citizens]) are about to enter in Chapter 14. I'll give you a few hints and then you have to guess where it is and PM me the answer.
1. It has been used in the POH series
2. Something plot-turningly terrible has happened there

It could be either...
A. Tartarus
B. Aurora's (POH) school auxiliary gym
C. Henvas's (MH) secret hideout
D. The crystal forest in Tartarus

Take a guess and private message back to me! The first person to guess correctly will get a character based on them in POH (Alura's Secrets for my POH crew)