Enter "Feats On the Sacrifices" state: Gather strength continuously and make the next attack with Heavy Sword more powerful (This skill can be only released on ground. When releasing you're in Yellow Armor state).
When releasing this skill, you can use these skills: Isolated City Sunset, Raising Lantern With Sword, and Endless War to interrupt, and trigger the Charging for Attack effect of these 3 skills (Increasing skill level can reduce skill cooldown time).