If the aspect reversal tactic works to become Grimdark, surely Eridan went Grimdark, right? As Prince of hope, he was doomed to be devoid of it, but Eridan's wand was OP, meaning he became hopeful. Visual clues also looks like Grimdark Rose.

A Prince destroys Hope (which he did with the Matriorb) and also destroys with Hope (his hope powered wand). The “visual” clues are just color contrast.