Here are some ideas that I've came up with whether you like it or not:
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1. Permanent Status Condition Immunity.
Depending on how OOO would approach this, each knight should be given 1 permanent immunity to an element such as Fire or Stun. After doing so, the knight will never have to worry about being effected elements in regular situations such as: walking through fire vents or poisonous thorns.
2. The /walk Command.
Obviously in the game's files, a /walk ability would be nice to have. Constant running isn't always favored by everyone. Why should NPC's in Haven be able to do something we are not? (A /run command will have to be added as well)
3. A Spear Weapon Series.
Similar to the Almirian Crusader's weapon, a spear should be put as a usable weapon. Just like the Calibur and Brandish Series, the spear should have a Normal, Fire, Shock, and Ice series. Possibly giving Normal and Pierce damage to prevent a Flourish repeat. (Weapon attack style could possibly be: Stab, Stab, Spin Attack / Charge Attack being the Almirian Royal Guard, Lance Charge)
Status conditions are meant to serve as a challenge, so I don't think a permanent immunity is very balanced. I might as well take fire immunity and do FSC in my chaos set, no worries about fire anymore!
Walk does exist as an animation rig, which only toggles when you are stunned. I don't find walking a need, everything can be done with the running we have now.
Spears?