The phrases from the passage which are oxymorons are;
Oxymoron is a figure of speech which gives two words or two phrases that are contradictory in meanings to one another.
The phrases; Happy dagger and Timeless end are oxymorons because a dagger when used depict sadness or harmful, So, it can't be a happy dagger.
On the other hand, timeless end is not possible because a end is an endpoint and cannot be timeless at the same time.
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