Mark of the Coven

You have manifested a mark of a Witch's Coven. Determine its appearance and the flaw associated with it. You gain the following benefits:

• Increase your Constitution score by 1, to a maximum of 20.
• You learn the Thaumaturgy cantrip and the Counterspell and will cast them through your mark. You can cast Counterspell a number of times up to your Constitution modifier (minimum of 1); you must finish a long rest to regain the cast through the mark. Constitution is your spellcasting ability for these spells.
• When you cast Counterspell through your mark, you must expend one of your Hit Dice and roll it. If you roll an even number, you gain a number of temporary hit points equal to the number rolled. If you roll an odd number, one random creature within 30 feet of you (not including you) takes force damage equal to the number rolled. If no other creatures are in range, you take the damage.
• In addition, on successfully countering a spell, the spell does not become negated. Instead, it will morph into a new spell based on the Conflux Table, with either caster being the target of the new spell determined by a coin flip. On heads, it is the source caster; on Tails, it is the coven marked caster. If the target caster is not a valid target for the spell, it would instead target as many objects or creatures as required within the spell's range to a minimum of 10ft.

You also develop a random flaw from the Mark of the Coven Flaws table.

Mark of the Coven Flaws

Conflux Table

1st-Level Spells

2nd-Level Spells

3rd-Level Spells

4th-Level Spells

5th-Level Spells

6th-Level Spells

7th-Level Spells

8th-Level Spells

9th-Level Spells

OPTION: GREATER COVEN POWERS

At the DM’s option, a character who has the Mark of the Coven Flaws feat has a chance of manifesting greater power. Upon reaching 10th level, such a character has a 10 percent chance of gaining an epic boon from among the options in chapter 7 of the Dungeon Master’s Guide. If the character fails to gain a boon, they have a 10 percent chance the next time they gain a level.

If the character gains a boon, the DM chooses it or determines it randomly. The character also permanently loses one of their Hit Dice, and their hit point maximum is reduced by an amount equal to a roll of that die plus their Constitution modifier (minimum reduction of 1). This reduction can’t be reversed by any means.