Solo Self Found or private league offline mode

Due to all those latency issues, I wish there would be a mode that doesn't rely so much on a stable connection.

It happens regularly that:
- The beginning of the animation that killed me is shown after I am already dead.
- Monsters are not at the location they are displayed and therefore take no damage.
- I can heal back from the death screen.

Campaign is still well playable, but the endgame is ruined.
Monsters get immune or hit you with invisible one shot combos.

I wish there would be a version, where the map is preloaded on your device to the extend that it doesn't cause synchronization issues.