Slime Diva is a boss in the video game ATLYSS. She is one of the first bosses the player may encounter, and the focus of the Diva Must Die quest. She can be summoned in the Effold Terrace by defeating the requisite number of Slimeks, only in the leftmost area after first clearing the Effold Terrace quest. This area is marked by two pillars with three slimes etched into each pillar and a sort of thin, flat arch connecting the two pillars. Inside of this area are sconces on pillars with green flames and a stone circle, in which Slime Diva spawns at the center, giving it a sort of arena like appearance. Slime Diva is referred to as the Queen of all Slimes, who are likewise referred to as her 'children'. She appears when the player slays many Slimeks in a short time, proclaiming her arrival by either mocking the player or reprimanding them for harassing her children, showcasing a twisted personality that nonetheless still cares for her subjects.
Angela theorizes that the Slime Diva is responsible for the appearance of Slimes in the Sanctum Catacombs and sends the player to investigate her territory. Later, she confirms her hypothesis and referrers to Diva's meddling as a 'deluded offense', tasking the player with eliminating her. Slime Diva is a large, humanoid Slime who resembles a lagomorphic Poon. Her body is entirely green, sporting pronounced curves and very long ears that reach approximately to her thighs, similar to the rabbit-like ears seen on her minions. She has unique eyes with black sclera, small eyelashes pointing downward and unique cross-shaped pupils. Her expression is typically fixed into a grin, and a dark spot in the centre of her face resembles a blush. Her outfit consists of a black, orange and red ensemble including a segmented top that covers her chest, but exposes her midriff and lower arms, a tabard around her waist with a long cape and several straps around her legs. She appears to be wearing black shoes, and as the Queen of the Slimes, she wears a pointed black crown. In each hand, she wields magical batons that she uses to cast spells to attack the player, that only she can use at their maximum capacity.