We have released patch Ver.15.0.1.0 to address the following issue:
Bug Fixes
Fixed a bug causing the "Guard Bash" Rampage Decoration Skill to activate in response to things other than monster attacks, such as certain locale gimmicks and endemic life.
Fixed a bug preventing the "Destructive Dragon Deity" quest from showing up in the Join Request search if players in the same lobby try to join this quest through the "Join Hub Quest" option.