Few ideas for True Paci Ending of HR:

- After the neutral Omega Tem run, Temmie spends time trying to convince Chara to go along with the new plan he has: gather as many monsters as they can together, then he can absorb everyone's SOUL and break the barrier
  = Chara ends up agreeing after seeing the horrors of the True Lab
  = Before the monsters can even get inside, Toriel ends up absorbing the SOULs this time. Toriel's magical/determination aura gets unstable/strong enough to cause a huge explosion, powerful enough to shatter the barrier. Chara's SOUL splits in half, but before both halves can shatter completely, one half is put in a container by Papyrus or someone
  = After waking up or whatever, it's revealed that Frisk is missing from Chara's head + Toriel is dead. The monsters advance on towards the surface with Asgore as their leader. Head to epilogue.

- There's one route, which is technically neutral. (Toriel is killed before this + SOUL absorbed by Tem) Omega Temmie is the final boss, going power crazy. However, the world isn't RESET or anything, so the monsters can still enter and see that thing. Temmie absorbs more SOULs and eventually shifts into Asriel, where you can then calm him down and release SOULs break barrier blah.
   = Chara wakes up, Frisk is still there this time. Toriel's dead, everyone's confused, but they all go to the surface with Asgore as their leader. Head to epilogue

- After Neutral run, Temmie convinces Chara that his new plan will work for sure to absorb all the SOULs in the underground and break the barrier. Plan is put into action, Hyperdeathish Asriel appears, everyone's battling for control causing more of a monster god amalgamate thing. The amalgamate splits with a poweroverload, along with Chara's SOUL. The halves don't shatter through determination- one half is Frisk.
  = Some monsters don't survive returning, including Toriel. The survivors head to the surface with Asgore as their leader. Head to epilogue.