Hello!!
The answer to your question would be that the phrases from the passage that are oxymorons
An oxymoron is a figure of speech in which apparently contradictory ideas appear together. As a dagger is a weapon, it is wear that it appears next to a positive adjective such as "happy". As regards "timeless end", it can be said that the end of something represents a conclusion, it has an "end point", so it is contradictory to say that the end is "timeless".