Accelerated Flight [Filir] as a Passive
Change Filir's flee stat skill into a passive.
You have already gone above and beyond what official ever did for Filirs (the skill was literally broken on official and gave no effect whatsoever), so amazing job on that. However, Filirs could still really use quality of life improvements in this area due to their severe weaknesses.
Filir archetype is to be high offense but fragile. This seems like a fair trade-off, except it's not. Due to their extremely low SP pool, lowest SP regen in the game, and high SP cost on skills, Filirs are perpetually SP-starved when played actively. Even when using only level 1 buffs, it will always get to the point in a matter of seconds where Filirs have no SP to cast any skills at all. They quickly lose their offensive capability yet they are already extremely fragile. Therefore, they suffer from two weaknesses for very little reward because their strength actually converts into a weakness rather quickly.
If Vanilmirths can have passive stat bonuses in the form of Instruction Change, can Filirs be given similar treatment? The passively added flee would be balanced by the Filir's finite health. Because they have the lowest HP pool and regeneration in the game, every damage they soak is quite permanent in effect because they will never regenerate the lost HP. They will still require moderate-to-intense support in order to perform well, but changing the flee buff into a passive allows players more freedom to use the Filir's small SP pool more offensively in the form of more frequent Flitting buffs and higher level Flitting utilization (level 5's 70 SP for a 40 second buff is a massive cost for Filir and is almost never utilized because of this, but not having to worry about saving SP for flee makes this a viable option).
Changing the flee buff into a passive akin to Vanilmirth's Instruction Change gives Filirs more of an identity as a glass cannon without breaking the game.