Past whisperer

(this feat comes in different stages (kind of like ranking of how weak the user's connection to the time dimension is), each being stronger then the last, a higher stage has all the perks of the previous stages. The progression between stages is possible, although not passively.)

Stage 0:
Your connection to the dimension of time is barely noticeably weaker then the average, causing you to experience more dejavu then those with a normal connection. The dejavu is rarely true (its just a dejavu.)

Stage 1:
Your weakened connection to the dimension of time allows you to rarely experience some parts of the past, ranging back to a maximum of 25 * stage years. This ability cannot be activated on command, and is only executed when a DM says so.

Each time you use an ability regarding this feat (all stages included), add 1 point for past (2 points if the event takes place more then 400 years in the past) and 2 points for the future to the "time sickness" counter. When the counter exceeds a 140/(Stage)*n ; n being a natural number (no decimal, > 0) you lose a part of your personality (decided by the DM.) Upon exceeding 1000/(Stage), your mind becomes further dulled, decreasing your intelligence and wisdom by 2 points. When the counter reaches 3000/(Stage), you reach a point of no return, gaining a horrendously bad case of alzheimer's disease (I shall name this "temporal alzheimer's"). Any recalling of past events requires an intelligence saving throw, succeeding if the roll is higher then 18. You also need to roll a d20 die each short or long rest to see if you can remember basic functions, succeeding if you roll higher then 5. The function forgotten is decided by a d6 die roll: 1-breathing, 2-talking, 3-eating, 4-walking, 5-conprehending language, 6-any action related to muscle memory of hands.

Stage 2:
You can sometimes (when DM says so) feel when something of importance/"big" (such as death, birth, events with a strong presence of emotion, basically anything DM deems as an influential event) took place near your character. You can experience such events up to 50 years into the past, or even more, depending on the event's importance (battlefield = 200 years, war = 500 years, .). Total number of years per event increases by *0.25 of the original for every stage over the third one.

Stage 3:
You can try to force experiencing an event outside the present by temporarily weakening your bond to time. You can use up a time point, and succeed if the roll of a (Stage)d20 die equals to or is greater than the number of years in the past which the event took place in. The event experienced is the most important one that took place in the past (what you rolled) number of years (thus it can also be something trivial such as: a rat dying.) You recover half your time points during a long rest.

Stage 4:
You are able to experience glimpses of the future, although not in the same way as the past. You may use up a time point and try to peek into the future. You can experience a up to Stage*5*seconds, spanning from a point in time that will take no more than (Stage)d6 minutes into the future.

Being able to see glimpse of the future, you are able to anticipate some events and react faster to them. You can expend a time point to give yourself a +Stage to your initiative roll or add a +(Stage) to your dexterity saving throw.

Stage 5:
Stage 1 now also applies for events taking place in the future.

Stage 6:
Stage 2 and 3 now also applies for events taking place in the future. You now also recover all time points during a long rest.

Having such a weakened connection to the dimension of time, you loosen your sense of the present, sometimes not being able to tell whether you are experiencing a past/future event or not. A healthy body requires a healthy mind, as such your constitution is decreased by 2 points, your conscience dampened and confused, which also decreases your wisdom by 1 point.

Stage 7:
You no longer need to spend any time points or roll any dice for the effects of Stage 3 to succeed.

Stage 8:
You are immune to the negative effects of stage 1, but have a small chance to become lost in the time dimension each time you use any of this feat's abilities. The chance is a 1 in 400 (there is no die for this kind of number so just use a random number generator or any other method with same probability.)

-- homebrew lore and creator's note--

Lore:

Time is a dimension that ties all beings with conscience to itself, binding them to a set of rules. One of these rules
is experiencing the world through a single, ever moving point in time (Time Singularity). This applies to almost every being in Reality,
to some less strictly then the others (gods, outer entities, The World itself...)

Very few beings, born during rare, abnormal activity of rifts in Reality left by The Breaking, have a weaker connection
to the dimension of time then others, allowing them to see glimpses of the past, and very rarely, even the future.
Individuals such as these were often prominent figures, advisors of kings, leaders of rebellions, their talent allowing
them to see a part of the world others could not.

Past whisperers is the current term, used when referring to someone with a weaker connection to the dimension of time.
Because "common" past whisperers only rarely experienced different points in time due to barely having a weaker connection
than the average conscience, they were usually referred to as nothing more then clairvoyant.

The strongest past whisperers in history were able to separate themselves from the Time Singularity, allowing them
to time travel, attain a state close to true immortality, see the past and the future at will, etc. While their
unique talent allowed them to attain an unpillared state of existence, they also served as their downfall. Every single
one of them went mad over the tens of thousands of years they spent while traversing the time dimension, pushing
them into a state of experiencing everything they ever have and will experience at once for an eternity, recursively,
causing them to experience infinity for an infinite amount of time, erasing their will and conscience in the process.
Since their death takes place in an undetermined point in time, every instance of their existence (as in being in
the present, past and the future) is just a hollow flesh casing, devoid of a will, preforming the actions of what
was once its conscience.

Lore, technical:

One becomes a past whisperer during birth (most commonly, bur there are also exceptions), when their will is being
bound to the dimension of time under abnormal circumstances. The abnormal circumstance in question is almost always
(there are other, much rarer cases) the activity of a rift in Reality, specifically one connected to the dimension of
time. This "leakage" interferes with the process of binding a will to time, making the connection ever so slightly
weaker.

Past whisperers experience the events that took, or will take, place outside the binds of Time Singularity by
weakening their connection to it. They can not use this on will, with the ability activating without their
control (they can increase the likelihood of activation with various methods).

Creator's note:

Besides it sounding cool and badass, it also serves a purpose of allowing the players to uncover mysteries of the past,
giving them a tool to get their characters information regarding lore, or just and edge when they are stuck on their
tracks (since DM decides how the feat works, they can give them hints regarding the campaign in a way it makes sense.)

!This feat is heavily dependent on a good, flexible DM!