The LEGO Nexo Knights Season 4 storyline takes places when Jestro gains the idea to ambush the Fortrex in hopes of cheering up the Cloud of Monstrox unaware that the knights are at the party.
Season 4 was introduced in 2017 and currently consists of 6 sets. As of today,
70356 The Stone Colossus of Ultimate Destruction is the most valuable Season 4 set with an estimated new/factory sealed value of $271.
Summary
Nexo Knights Season 4 Aaron's Rock Climber set 70355 was released in August 2017, retailing for $60, but has since been retired. New, unopened Aaron's Rock Climber sets are valued at $190, while used sets can be found for $116.
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