Boa's Mass Hysteria

You infect a creature with a madness untold. The creature must make a CHA saving throw of your spell save DC. On a failed save, the creature is charmed for 5 days. 

While Charmed, choose one of 2 options

-1. The creature is under the effect of any other spell you know which charms.

-2. A new effect which the DM agrees is appropriate

When the infected creature is observed by another creature in this madness, that creature must make the save themself or become charmed the same way. At the end of 5 days, a creature that comes into contact with the madness must make the save again, with advantage. Each additional time this occurs, the save DC decreases by 1. The spell as a whole ends when no creature is infected by it anymore. 

"Look, power word kill is great and all, but I just don't think it embodies everything that enchantment is supposed to be! So I went and made this. I regret nothing and those civilians had it coming."

-Boa Wildwood, on the creation of this spell.