To get Water Breathing V2 in Weak Legacy 2, follow these steps:
- Reach Player Level 200 by completing story missions and boss quests to earn experience.
- Accumulate 100,000 Yen through gameplay and defeating mobs.
- Obtain Water Breathing V1 first by visiting the Urokodaki Trainer NPC at Slayer HQ, being at least level 5, paying 1,000 Yen, and completing the "Kill 25 Demons" quest.
- Max out Water Breathing V1 Mastery to 200 by using it in combat to gain mastery experience.
- Collect 5 Crystal Essences, which are obtained from dungeons around waves 25 to 49.
- Find the Giyu Tomioka Trainer NPC for Water Breathing V2, who is located on a hill near Slayer HQ; you'll need to climb a cliff near a Tokito Boss to reach him.
- Talk to Giyu Tomioka, pay the required Yen, and complete the quest to defeat Tanjiro (Water) 5 times to unlock Water Breathing V2 mastery.
Water Breathing V2 includes moves like Water Surface Slash, Striking Tide, Waterfall Basin, and Constant Flux, with some moves being perfectly blockable but not blockable normally.