Malicious/Chaser Emblem is Broken for Plague
It is very hard to get iridescent malicious and chaser on Plague for multiple reasons, one of them being that healing at her pools of devotion deducts points from you, but you don't seem to get points for survivors becoming passively injured from the infection.
It's hard to get iridescent chaser on plague because when you infect a survivor and leave them to spread infection elsewhere, the game counts you as not winning that chase, even though taking that chase would hurt you in the long term if there are other objectives to defend.
I think the chaser emblem should not count her as losing a chase if she infects a survivor before leaving them. I also think that the malicious emblem should count survivors getting injured passively by infection as you injuring them.