Here's Shadow Jevil, based on Undyne the Undying, cause why not, and you can even see him wearing the shadow mantle, based on eram. For ch1 of course, you can fight him at the end of the chapter if you only open his jail but don't enter, see ya and bye>:)

Time to meet Eramb, you unlock under interesting circumstances, bye giving him the shadow mantle to free him from his stone form, but then he gets plugged ina nd is corrupted by Eram/The Mantle, and you and the party are sent into the game, welp see ya>:)

Seam, the High Mage, a castle town ch2 secret boss, testing you to see if you are worthy of even wielding the shadow mantle, in which of course after the fight he can't find, but he does have something, a shadow crystal in his empty eye, welp see ya >:)!!

Finally, a sprite for the Killer Empress, this was actually made a while ago, but i just forgot to post. At least she got her spotlight now, and expect at least 3 new pieces of art here soon, and all are really nice, so see ya here soon, bye >:)!!!!!!!!!!

Torawareta rivu~aiasan, the Leviathan within the depths of the Third Sanctuary. Imprisoned by an anchoring chain and put under spell to destroy everything in sight by the night, thanks to the Knight and their Shadow Crystal, a new type of enemy it seems..

Meet the Angel of Television, or better known as Tenna and the Angel in the Titan role. He is based on omega flowey cause what better character to base off of than them, welp see you another time here soon, bye and see ya >>::::))))))!!!!!!!!!!!!!!!!!!!!!

Time to meet Miss Florel, the Keeper of the Destroyed Garden. Yep you get want some of you want, a flower boss for ch3, and is basically a combination of flowey and muffet in terms of battle, personality, and design, hope you enjoy it bye >:)!!!!!!!!!!!!!

Miss Waterfall Mizzle, swaps with Lanina, which means Jackenstein swaps with Lanino, i noticed some people doing this swap and it clicked to me that this actually makes sense to some degree, welp enjoy the art and see ya in the future, bye >:)!!!!!!!!!!!!

The Mantle Keeper, the Shadow Keeper, and the World Keeper, character, secret boss, and weird route boss for ch4. Yes Ralsei swaps with the old man, with provides and interesting and different storyline/arc for Noelle, well see ya soon and have fun >:)!!!

Welp, here is The Real Mike, yup mike is real and is a secret boss, and how you unlock him is basically similar to trying to find the eggman, but instead you do it after you beat the 3 mike stand-ins, so yeah you get Castle Town boss fights, see ya >:)!!!