Adventurer Link Skills
Warrior: Invincible Belief – When your HP reaches critical levels, your HP will be healed.
Magician: Empirical Knowledge – By identifying your enemies’ weaknesses, your damage and defense ignore will be increased.
Archer: Adventurer Curious – Your monster collection registration rate and critical rate are increased.
Thief: Thief Kerning – Using the cunning skills of a thief, weaken your enemies and increase your damage on them.
Pirate: Pirate Blessing – Pirate’s unique strengths permanently increase their stats.
Although Chief Knights not dropping items is intended, since it also includes their Codex cards, this would mean that if you have not finished the Henesys Ruins set prior to Feb. 28, you can't finish the set now.Source: https://orangemushroom.net/2017/10/25/kms-ver-1-2-286-fox-valley-halloween/
When fighting the boss Cygnus, you can now re-enter the boss if you defeat the Awakened Chief Knights without defeating Cygnus. The Chief Knights and Awakened Chief Knights will no longer drop items.