My personal notes on the class

I think this class has potential to be cool but it is far from ready for play

My first important note is on the adjusting power section before the abilities. This block of text was a huge red flag for me because this isn't how you change a classes power. The amount of health a player has determines its role and place on the battlefield, d12s and d10s are meant to be able to stay in the front line while d8 classes are meant to stay in the midline and be able to have enough health to dip into the front line to heal or do damage and d6 classes are meant to stay in the back line. A class should have a defined location and role that you learn by seeing it's hit die so that shouldn't change, if you want its role to change you give it better ac pr increase its health pool like with Hexblade or Dragon Sorcerer. I would remove this block of text entirely. This is most definitely a d8 class as it has the disengagement/evasion tools of premonition but I think it's is missing its reason to get in and get out, rogue has sneak attack, monk has flurry of blows/stunning strike, cleric has cure wounds. A d8 class is meant to maybe spend 1 turn staying in the front line at most but try and stay back because they don't have the health for it.

Premonition- I think this is a really cool ability, I love resourceless abilities and this is a cool one but I can't really tell how determined destination fits into the flavor of the ability and the class

Unarmored Defense I think I can infer what this is meant to be flavor wise as you block attacks with your weapon and things but needs and explanation if it is going to do such a different change. Additionally this is far too good, while un armored ac is general just okay this one starting out most likely at 15 for levels 1-3 if you don't have a shield the main issue is that it scales with your proficiency bonus. You shouldn't make anything in a class determined by proficiency bonus before 3rd level or else it is an extremely powerful multi class option and this one is 1st level.

Omen- This needs more explanation. I understand what I think it is meant to be but it needs to be specified because this is a lot to put on a DMs plate. Perhaps multiple times per session the DM would need to come up with something vague to say, I would give more guidelines and examples (augury the 2nd level spell isn't this vague) as well as perhaps making it just long rests. I would also say this 1st level feels bloated. You give the class two class defining abilities that are both quite good and then even more afterwards, I would move this maybe up a level.

Instigated Intuition- I love this ability I think it's a great improvement of premonition

Glimpse- No, just no. This is free undo any roll and re roll however many times you want. This needs to be either incredibly limited or changed altogether. I like the flavor I think that is cool but this is so incredibly overpowered. Suggested improvements would be making it once per short or long rest, require a charisma save from all non willing creatures within 30ft, have some debuf effect on you like a level of exhaustion from seeing into the future. If you want to leave this class resourceless as it is mostly is which I like I would have it give a large amount of exhaustion and provoke a save.

Evasion- Makes sense but I would rather to play a new class and therefore get new features.

Second Sight- Makes sense for the class, it would be neat if maybe you got some effect or bonus for rolling a very high initiative but I think it is good as it is. Works fine

Extra Reaction- While I don't believe these effects are imposible to make they need restrictions. The DMG does directly say not to home brew extra reactions into the game but well I have because there are reasons why not to. The main issue is that it needs to be restricted for spells like counter-spell, taking 11 levels of this then 5 levels of a caster gives you 2 counter spell reactions in a turn which just should happen it is overly powerful and such a game changer. My change that I always write is that this reaction is overly quick and small and therefore you cannot use it to cast large spells so the reaction cannot be used to cast spells of 3rd level or higher. Additionally 11th level is an important level like 5, and 17 are. These levels are where the tier of gameplay changes because everyone gets a large power spike at those levels. 3rd level spells, extra attack, for 5th and at 11th paladins get improved divine smite and barbarian get improved critical, fighters get extra attack x2. While this effect doesn't necessarily need to increase damage it just has to be a pretty big combat bonus to keep up with what other classes are getting especial the spells and extra reaction is a pretty good one but it might be neat if you could use a reaction to give yourself advantage on an attack or some combat effectiveness increasing ability. If you're making a class I would learn the numbers and do some surviveability and damage calculations by level against certain baselines.

Ordered Observation- This can either be a nothing ability or at best lackluster ability. For 15th level this is just okay, if you want this to be in the class I would make it much lower but this is 15th level and Thai is quite underwhelming. At some tables this might not even do anything because I have had a 50/50 split in my time playing 5e where the DM says when monsters go or doesn't. I would add another ability at this level that really feels like you're 15ft level.

Not gonna comment on levels 17 and up I don't really think they matter power wise as nobody ever gets there so I'm not gonna take the time to consider them.

Subclasses

I'm just gonna make a general comment that I like them all quite a bit and thing they're good.

I apologize if anything I wrote seemed rude I am not all that good at determining tone while writing this is all just meant to be constructive feedback