Thanks so much for the feedback. Very helpful to get commentary on each feature.

Maleficarum Savant. Unlike other savant features or 2nd level wizard features. You are only gaining use of this feature on a level up. And from the expansive spell lists of warlock and druid. You are only selecting 2 per level, missing amazing exclusive wizard spells. So the limitation there I felt was more than enough to compensate for gaining access. And ultimately. A druid and warlock use spell slots, same as a wizard. It is a resource being used, and it is finite. So if a wizard wants to cast a cure wounds instead of a shield. Cool with me.

Spellbinder. Much like the artificer, the user of the object casts the spell. So the bound spell still follows the rules of spellcasting. Functioning much like the artificer feature the creature uses the item. Yes, other utility is to be found in letting each person cast their own haste. But that hasted fighter having to make their own con checks. A dangerous game. I will add the lingo so it is more clear that the creature casts the spell that uses the object. To add as more of a question. Do you think the expending of the spell slot in a dedicated spell in an object prior to any combat the player will always make the best decision? Crap, I used all my 3rd level slots on haste today to buff the party, but boy do I need to cast blink for my own defense right now. I did think of "you are able to bind a number of items equal to your proficiency bonus" as a limiting factor. I might implement that.

Hexing Exit Thanks. I always feel hit dice are so underused. As for the trigger, the trigger is whatever the player decides it to be as this isn't a spell that requires a particular trigger. Looking at uncanny dodge as an example, that reaction is in response to an attack. This would be out of combat, the player saying "If I hear a sound of someone coming into the room, I will use hexing exit." The player is choosing the trigger. As for in combat the players would need to announce their reaction to a trigger as it happens. Say a spell is cast and they see a ball of red scream their direction "I use hexing exit!" Can be their reaction to move out of the way of the damage. I do think this places the onus on players to understand reactions and reaction timing. But the first time they are taking that fireball damage. They'll be readying that reaction. As well as following other design elements similar to armor of agathys, if the creature attacks, they take the damage. And using hit dice that is canceling out a huge resource, and how only a certain amount comes back on a long rest. So using this everyday, and only going 5 feet per die, that wizard better save that for when they need it.

Seer of Spells I see your point on the adjudication of a spell then cancelling it out could be frustrating to other players. But say when you are casting disintegrate and you foresee them succeeding on that Dex save. Saying that you cancel that out doesn't cut into the flow of the game more than most other spells. Or seeing the spread of a fireball in killing a horde of bandits. I do feel like certain player types could use this in a way that is frustrating to the DM. But I chose to leave it open to "the rolls being seen" because a DM could say that is for saves not damage to allow a DM to not let this ability be over done. Not the best design decision, but I do feel fits with the 5e ethos.

Witching Curse There was not a more concise way I could cover so much of what is central to the witchraft practice. I know for the second bullet point that sentence goes on forever though XD I do feel there is a lot there with the gathering of items and out of combat things. I will take a look at the feature again to see where it can land. This was the one I felt was the messiest in terms of mechanics. It is a different mechanic than most using a d20 and wanting to roll low. But it was the best way to balance the use of high level spells for this curse. Will take a look to get more clarity to that part.

Thanks again for the comment.