tldr:
• Snake Scales in PVE Viper please. PVE Viper needs a mitigation, carbon copy of how the skill performs is fine. Homage to removed skill Hissatsu: Seigen
• World-swallower to gapclose with a 10-yalm 10k potency damage + Heavy proc, yes please.
• Grant guard pierce for First-Second-Third-Fourth Generation weaponskills like how First-Second-Third-Fourth Legacy weaponskills do. The risk in staying within enemy range during a melee already presents itself to be a risk/reward to utilized these weaponskills. Present potency for these skills levels do not present a concern for PVP balancing.
• Generation/Legacy weaponskills are an option for the player to use, players can easily just World-swallower followed with Ouroboros and treat it like a typical Limitbreak (10k potency with Heavy proc + 10k potency to end LB state, 20k potency is normative Limitbreak potency).