Necrotic Flame of the Abyss (Necrotic Fire)

When you gain this feat, you inherit the following benefits:

• As a bonus action, you can imbue your fire spells with necrotic energy, changing the damage type from fire to necrotic. This transformation lasts for 30 minutes or until you use a bonus action to return the damage type to fire.
• While your flames seethe with necrotic power, spells you cast that deal necrotic damage pierce through resistance to necrotic damage. (Locked) Moreover, if a creature has immunity to necrotic damage, it is treated as resistance instead.
• (Locked) When you cast a spell that inflicts necrotic damage, you may re-roll any 1s on damage dice, but you must use the new roll even if it is another 1. This feature can be used a number of times equal to your proficiency bonus, and all expended uses are restored after a long rest.
• (Locked) Additionally, once per long rest, when you deal necrotic damage to a target, you can choose to afflict them with a weakening curse. For the next minute, the cursed target deals half damage with weapon attacks that use Strength. After applying this curse, you can’t use this feature again until you finish a long rest.