Cantrips. You learn two cantrips of your choice from the Warlock Spell list. Neither can be eldritch blast.

Spell Slots. The Accursed Keeper Spellcasting table shows how many spell slots you have to cast your spells of 1st-level and higher. To cast one of these spells, you must expend a slot of the spell's level or higher. You regain all expended spell slots when you finish a long rest.

For example, if you know the 1st-level spell ice knife and have a 1st-level and 2nd-level spell slot available, you can cast ice knife using either slot.

Spells Known of 1st Level and Higher. At 3rd level, you know three 1st-level spells of your choice from the Accursed Archive spell list. The spells known column of the Accursed Keeper table shows when you learn more Accursed Archive spells of your choice of 1st-level and higher. A spell you choose must be of a level no higher than what's shown in the table's Slot Level column for your level. When you reach 7th level, for example, you learn a new Accursed Archive spell, which can be 1st or 2nd level.

Trading Spells. When you visit the Accursed Archive, you can trade a number of spells you know of 1st-level and higher equal to your Proficiency Bonus for others from the Accursed Archive spell list. To do so, you must spend 15 minutes reading from the tomes in the Archive per spell you wish to trade. After you do, you replace one spell you know with another from the heretic spell list of the same level.

Spellcasting Ability. Wisdom is your spellcasting ability for your heretic spells, so you use your Wisdom whenever a spell refers to your spellcasting ability. In addition, you use your Wisdom modifier for setting the saving throw DC for a heretic spell you cast and when making an attack roll with one.

Spell save DC = 8 + your proficiency bonus +

your Wisdom Modifier

Spell attack modifier = your proficiency bonus

+ your Wisdom modifier

Forbidden Lore At 7th level, select three Eldritch Invocations, found within the Warlock class description, that you meet the prerequisites for, and choose one to gain the effects of. You cannot choose any invocations that call for you to use a warlock spell slot, with prerequisites above 7th level, or with prerequisites involving a Pact Boon. Anything that refers to your Charisma modifier instead uses your Wisdom modifier. When you visit the Archive, you can spend 15 minutes studying the other Invocations, swapping the one you have for the one you don't. Once you do, you can't do so again until you complete a long rest without visiting the Archive.

Nightmarish Aspects Starting at 11th level, you gain several features akin to those of the Silent One. You gain blindsight out to a range of 15 feet. Additionally, when you score a critical with a weapon that is affected by your Crimson Rite, the target of the attack gains 1 point of exhaustion.

Rend Chronology Starting at 15th level, You can use an action to call forth the Archive's stagnant passage of time, suffering damage equal to your Crimson Rite damage die. You gain three additional actions, which you may use to Attack (one weapon attack only), Dash, Disengage, Search, Use an Object or enter the Archive. Once you have used this feature, you must finish a long rest before you can do so again.