You use the stones base one what endgame high dragon trial you want to try. Id say just keep it for now until they announce the next high dragon. That way you have time to prep and even learning ground.
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2-3 combos then forcestrike for standard rotation. Use skill 2 before skill 1 or just s1 when s2 is down. Recommended wyrmprint is shining overlord. Theres also a build using chocolatiers WP but that WP is limited during Christmas.
Hes mostly known for destroying OD bar so spam that when it happens.