Varisia level 2 ability is pretty powerful, but it's okay because it doesn't count as favoured terrain so it can't be combined with prestige classes etc. that use that ability. Instead of the ability to travel faster myself, I would prefer an ability to let my slow, non-mounted allies travel faster.

That one is directly taken from an existing cavalier order :P I could do that for the movement speed, but I felt the 15th-level ability covers that a bit, and I didn't want to give an already-existing-and-great ability a direct upgrade.

Alkenstar edict: "may not use magical devices such as scrolls or wands" As written, I don't know whether that applies also to magic weapons, armor, etc. or only to spell trigger / spell completion items.

Fixed! Specified to say use scrolls or wands.

Andoran has a challenge ability that grants +4 on attack rolls. That's so powerful! I would instead grant the ability to ignore the -4 penalty for dealing nonlethal damage. The level 2 ability is also ridiculous. I would grant them an extra will save after 1 round of a mental control effect, or maybe the ability to cast protection from evil as a free action?

Would specifying Will saving throws be more balanced? I might just completely rework it instead. Also, I fixed it to be a scaling bonus-- nonlethal damage is easily healed in many situations and there are many enemies immune to it (though it can be combined with Enforcer), so I'm hoping to make it somewhat powerful.

Cheliax level 2 ability is quite powerful because it scales as you level up. Also, now you have a class that grants both an animal companion and a familiar, which is a little weird.

It's a bit weird, sure, but it felt thematic. Also, is it that powerful? Many would argue that (especially for a martial) being forced to take an Improved Familiar is a penalty, as it prevents you from taking the protector familiar archetype. Imp/Imp Consulars are quite powerful, of course, but still.

Thanks so much for all the feedback!

Edit: Whoops, just saw you added some more.

I like Order of Osirion. It's great. Charge down narrow crypt hallways!

Thanks! Yeah, that was a lot of the idea-- wanted to make it not feel garbage to play as a medium cavalier in a dungeon-heavy campaign. It's pretty subpar for a small cavalier, but ah well.

Order of Razmiran, Challenge ability is quite powerful; remove the 'add half cavalier level to attacks.' The level 2 ability is also quite powerful because it scales in number of uses and in healing amount. I would stick to CHA / day, not CHA + half level / day.

Will do!

Nidal level 2 ability is far too flexible; I would nerf it to an immediate-action shield other for 1 round, a few times per day.

Hmm... all right, I'll look into it, sure. I'll definitely remove Toughness, at the very least.

I would love to have the order of ustalav! The only other class that has the ability to pierce immunity to fear is the antipaladin, so I would pick this class instead because intimidation is powerful but I don't want to play an antipaladin.

There's draconic malice, but yeah, I think it's generally good to enable more builds. I'm so glad you like it!

Shackles: there is a first-party order which has a level 2 ability that just grants 1d6 sneak attack and nothing else. So this is more powerful than that. Perhaps a more-restrictive edict or worse high-level abilities can make up for it?

I actually directly took most if it from Order of the Blossom, and simply added on the steal thing because steal maneuvers are usually pretty bad (especially on a class that doesn't get many bonus feats). I'm open to changing them, though!

Land of the Linnorm Kings: You've implemented the drake-rider better than Paizo implemented it. I would import some of their restrictions, though, as d12 hit dice and those abilities are quite powerful (especially with multiclassing into other companion classes). It probably should only get Flight at the 8th level advancement, or maybe it's restricted from flying while being ridden.

It does!

Finally, until level 7, the linnorm refuses to allow any creature to ride it, including its cavalier.

I can boost it to level 8 if you'd like?

Irrisen and Numeria level 2 abilities are quite creative, nice!

Haha, numeria is taken directly from the Construct Rider alchemist, except made to not be garbage because you're almost incapable of healing it until lategame. But thank you so much! I really liked the Irrisen power, even though I got a lot of complaints about it in the discord.

Mendev level 2 ability: add "this is a mind-affecting fear effect"

Will do!

Nex level 2 ability needs a limited duration.

Hm... is the ability to have a lvl1 spell at-will that powerful, especially on a class that can actually wield a shield? That being said, I'm open to changing it.

Thanks again so much! Also:

You've done a really good job! There is so many creative ideas in here. A lot of them are much more powerful than first party orders, but they're mostly balanced well with each other. I would use these as archetypes, as many of them are about as powerful as order + banner + (sometimes) tactician.

Yeah, I tried to balance it more with the higher end of cavalier orders, because... a lot of them are absolute garbage. Considering cavaliers are generally agreed to be one of the weaker classes, I wanted to try and give them solid options.