Otherworldly Patron

At 1st level, a warlock gains the Otherworldly Patron feature. Here is a special homebrew option for that feature: Holy Flame Patron.
You were selected by The High Council of the Holy Flame to archive, the history of the Holy Flame. Written history has been banned by The High Council, it is instead stored in the minds of the High Council and the Warlocks they have created to aid in the storage and protection of their knowledge. When required you can use your knowledge to aid your allies or hinder your enemies.

Expanded Spell List

1st-level Holy Flame feature
The Holy Flame lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you.

Holy Flame Spells Table

Bonus Proficiencies

1st-level Holy Flame feature
You gain proficiency in the History and Religion skills.

Archival Knowledge

1st-level Holy Flame feature
You draw upon the Archives of the Holy Flame to temporarily learn a new language. You gain one additional language which can be changed upon completing a long rest.
Additionally, you can cast Comprehend Languages and Identify as a ritual.

Archival Guidance

6th-level Holy Flame feature
You can use a bonus action on your turn to choose one creature that you can see within 30 feet of you, including yourself. You create a link to that creature allowing them to draw on the Archives of the Holy Flame to gain a bonus d6 to one ability check, attack roll, or saving throw it makes. The creature can wait until after it rolls the d20 before deciding to use the Archival Guidance die but must decide before the DM says whether the roll succeeds or fails. Once the Archival Guidance die is rolled, the link is severed. You can only have a link to one creature at a time. The link fades if not used within one minute.
You can use this feature a number of times equal to your Charisma modifier (a minimum of once). You regain any expended uses when you finish a short or long rest.
The die size increases to a d8 at 10th-level and a d10 at 14th-level.

Additionally, you learn the Guidance cantrip and it is a Bard spell for you.

Expertise

10th-level Holy Flame feature
Your proficiency bonus is doubled for any ability check you make that uses History or Religion.

Enhanced Archival Guidance

10th-level Holy Flame feature
Well linked to another creature, the linked creature can add your Charisma modifier to any saving throws they make. This stacks with an Archival Guidance die roll if it is also used for the saving throw.

Archival Deception

14th-level Holy Flame feature
You can instead create a link with a hostile creature, doing so reduces their attacks and save DCs by 1 for the duration.
Additionally, you can use your reaction to roll your Archival Guidance die and subtract the roll from their attacks or save DC until the start of your next turn.