Shadow Hunter

You have honed your connection to the shadows, gaining the following benefits:
When your Hound of Ill Omen reduces a creature to 0 hit points, you regain 3 sorcery points. You can regain no more than half of your sorcery points in this manner within a 24-hour period.

Instead of summoning 1 panther, you summon 2 shadow panthers

As a bonus action, you can convert a number of sorcery points into charges for the Ark of the Shadow Feline equal to the number of sorcery points expended.

As a bonus action, you can convert a number of charges from the Ark into sorcery points equal to the number of charges expended.