The Necromancer Minosaur is a Necromancer-themed Minosaur created by the Druidon Tribe from the negative emotion of Master Pink, based on her desire to be revived and is the antagonist in episode 22 of 2019 TV series called Kishiryu Sentai Ryusoulger.
The Necromancer Minosaur made it first appearance where it made a portal in the sky right above the Ryusoulgers and was about to take souls of the citizen that lived in Japan, but Koh interfered it and he was taken to the realm of the dead. However due to being created in a realm where Hades live its impossible to deal any attack on that minosaur, so the RyuSoulger used the ShineRaptor to get Koh out of that illusion.
The Necromancer Minosaur was then about to target a bunch of people that are going to this venue but this was also prevented thanks to Koh by using the ConcealSoul on the sign that was pointing the way to the show.
Now in order to get the dimension that the Necromancer is in they used power of both the light and darkness of these raptors in order to become the CosmoRaptor and with its power Koh used it on Tyramigo to become KishiRyuOh CosmoRaptor which allowed it to travel into any dimension that the minosaur was created in i.e. the realm of the dead.
So with that the Necromancer Minosaur was then destroyed by its finisher called Cosmic Breaker causing everyone that's been revived was sent back to the realm of the dead.