You have manage to take control over a curse placed upon you and can now inflict it upon others.
Prerequisite: Able to cast at least one spell.
+1 to your constitution
You can cast Hex at 1st level as a bonus action without expending a spell slot. This can be done a number of times equal to half your proficiency bonus rounded down plus your spellcasting ability modifier, per long rest.
Overusing your curse will create a backlash and cause harm to yourself as well, dealing 1d8 necrotic damage with every usage over your allotted number.