User blog comment:SayuriDarling/The Blood of Olympus Official Discussion/@comment-26406700-20150518221823

i think the blood of olympus was a sinful ending to the series i would have rather have  an extreme utopian ending than a subjective, confusing ending since the books  series started from 'the lightning thief and the heores of olympus  was a second part series from the percy jackson series. In my opinion there should be ONE last book to sum up any loose ends since many fans have been disappointed by the ending. Understandingly Riordan wanted to leave the story to the readers imagination, however if he cleared up the loose ends then we could rest in peace as reader. Then in our   imaginations  we could create a further series  in our mind    (or in a public forum known as a fandom ,(apparently) . I certainly do.  To an extent this is the purpose of books and films to spark the imagintion of the mind and prepare us to be the future generations of designers ,artists ,scientists etc.

Finalement the last book of a series should tie up loose ends and should be stepping stone for futher imaginantion

from dragontransformer