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Ryunosuke is a Support Long Sword Adventurer. Eating in certain stances grants energy. Becoming Well-fed strengthens his Spirit Blade attacks.
Combat Details

SR; Fire specialization.
Collect Feast, Craving and Ravenous Energy to enter Well-fed for 50 seconds. It adds three rupture hits to his skills. Linear Slash, Inebriated: Torrent and Piercing Flavors: Thousand Needles provide the three energies.
Grand Feast grants a fire-damage buff and ailment immunity for 10 seconds. Well-Fueled costs 30 Insight points, adds a 20% fire-damage boost and extends the buff by 10 seconds.
Myriad Flavors Charge follows the main Adventurer's Burst hit, heals the squad and clears ailments, with a 50-second cooldown.
Acquisition
Claim a free copy from Rank Rush at Adventurer Rank 30. He also appears in Standard and Rotating Recruitment and can appear off-banner.
Preferred Gifts
Thick-Cut Tail, Black Pearl Roe, Prized Matsutake