Mōsō Mōsō no Mi

The Mōsō Mōsō no Mi (妄想妄想の果, Mōsō Mōsō no Mi) is a Paramecia-type Devil Fruit that grants the user the ability to put the designated target in a delusional state, known as The Oblivion (オブリビオン, Oburibion), while the victims are referred as a Dreamer (夢想家, Musōka) or a Sleeper (スリーパー, Surīpā). The consumer is therefore referred as a Delusional Human (妄想人間, Mōsō Ningen). It was eaten by Marshall Lovecraft.

Strength
The Mōsō Mōsō no Mi's primary strength and foremost power, is undoubtedly the ability to put the designated target into a delusional state. To perform this, however, the user chants out the phrase "Be Confined In Delusional Justice! (妄想正義に閉じ込められます! Mōsō Seigi ni Tojikome Raremasu!)", hence spraying out a fluroscent and fragrant aroma that coils the designated target. In the drop of a hat, columns of light will envelope the designated target completely once they smell the aroma, and then explode into flocks of glittering particles, leaving the designated target somewhat unscathed. However, the widescale destruction the columns of light provoke greatly affect the designated target mentally rather than physically. The designated target will have their thoughts "flushed away", and will have their perspective drastically change into abiding strongly in their cognitive bias, thus delusionizing them and leaving them to blindly perceive what they see in sheer imagination, rather than reality. The power of this brutal method is so great, that those who make physical contact with the designated target during the delusionizing process will also succumb to the power mentally. It is also noteworthy that sheer willpower alone is not sufficient to resist the delusionizing ritual, thus making it a formidable power to reckon with. The user is also immune to the effects of the power.

Weaknesses
Other than the standard Devil Fruit weaknesses, the designated target must smell the aroma to succumb to this power, so holding their breath will most likely prevent them from succumbing to the power. Also, the user's chanting phrase may take time to chant, thus allowing the designated target to retaliate. On the other hand, the aroma can be easily vanquished by conventional means, such as blowing it away with gusts of wind, smoking cigar and other methods. Also, the designated target may be cured by consuming appropriate substances and medicines, but it is noted that it doesn't completely cure the victim, thus the victim must consume it according to the schedule given.

Trivia

 * The image is taken from the Pokemon, Gengar from the Pokemon franchise.