"Forgotten Warlock"

A warlock whose patron has been forgotten to time or to the warlock alone. As the warlock levels up, they gain access to memories of their patron giving them access to more and more of the pacts power.

Shattered Lessons

Your body has built in instincts from lessons you can't remember you learned, when you fail an attack roll, ability check, or saving throw, add 1 d6. You can use this ability a number of times equal to your chr mod per long rest.

Fragmented Spells

Your body remembers spells that you were once able to cast, when you reach the levels listed below you always have that level's spells prepared.

Forgotten Instructions

You now realize that the power you have been drawing on was taught to you by someone, or something, you don't know who taught you, but you can remember certain instructions they gave you. At the end of each long rest choose 2 of the following instructions to remember. At level 12 you can choose 3 instructions per long rest.

Do Not Be Seen - When you are targeted by an attack, you can use your reaction to teleport up to 10 feet to an unoccupied space you can see. You take half damage from the attack, and you can use this ability 3 times per long rest. 

They Cannot Know Your Name - When a creature you can see targets you with an attack, you can use a reaction to force it to make a Wisdom saving throw DC equal to your spell save DC. On a failure, it cannot target you with attacks until the beginning of your next turn. This also works on multi attack spells, with the cavate that the DC goes down by 1 per 2 attacks above 1. You can use this ability 3 times per long rest.

Speak the Words - When you cast a spell that forces a creature to make a saving throw, you can cause one creature that succeeds to instead fail. You can use this ability 3 times per long rest.

Do Not Die Here - When you would be reduced to 0 hit points, you can drop unconscious with 1 successful death save. You can use this ability once per long rest.

Do Not Miss - When you miss with an attack roll, you can reroll the attack. You must use the new roll. You can use this ability 3 times per long rest.

Leave No Trace - When you deal damage to a creature, you can cause it to forget that you were the source of the attack until the beginning of your next turn. You can use this ability a number of times equal to your chr mod.

Pact Rememberance

You have regained enough memories to know that your patron can sometimes return to you a spell slot that has been used. After expending a spell slot, you can choose to roll a d20, if on the d20 you roll the number equal to your current warlock level you regain the spell slot used. You can regain 2 spell slots per long rest.

Patron's Watchful Eye

You have regained many memories of the patron you once had, but up until now it hasn't felt like the powers you've been drawing have been linked to your patron, rather they were instinctually there because of your fragmented mind. Now you can feel the link that you have with your patron, you still don't know who they are, but you can feel the direct link, and you can feel that regardless of how you've felt they were there making sure you had every possible benefit they can give you. You understand that above all your pact was made to protect you.

Once per long rest your patron can directly intertwine their life force with yours. When you are dropped to 0 hp you can choose to teleport to any unoccupied space within 30ft. You are unconscious, but do not have to make death saves, unless you take damage again and the damage is higher than 15% of your max hp, at which point you roll 1 death save and the roll on subsequent turns.

TO CLARIFY: While unconscious in this way you do not make death saves. If an attack with damage greater then 15% of your max hp hits you, you automatically roll 1 death save and then roll again on your subsequent turns.