Epiclurker
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When the princess was attacked by the silver ranked assassins.
The story showed he viewed his sister as nothing more then a disposable pawn. He finds out who his enemies are and gets rid of a rival for the throne.
A heavily injured assassin who has been blindsided tends to lose to opponents they would normally beat.
I think he simply gave instructions not to be disturbed. Closed door cultivation tends to be close to a self induced coma so outside of emergencies no one would try to communicate with them, any distractions could cause them to lose power or die due to feedback.
Didn't the son notice that his father was lying about which portal he used, pretty sure it was the other nobles that were left out of the loop.
1. There would be parties constantly coming and going so there would be someone outside most of the day. 2. It is implied that all but the prodigies go into the dungeon in parties so someone coming out alone means either they're OP or the rest got killed.