Best Plague Builds With Limited Perks

Okay so I'm trying to buff my friends account but problem is he has a limited amount of money and spends all his shards on survivors. He does have plenty of BP though, so what's the best build I can make out of the free killers, plus Nemesis, Twins and Legion?
Anybody?
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Thanataphobia
Corrupt Intervention
Discordance
Free Slot
CI
Lethal Pursuer OR Discordance
Thana
Eruption
Whose perk is Thana's?
Nurse
Oh of course, thank you!
Considering you're using plague her teachables are honestly quite good for her.
I'd go with this:
Corrupt Intervention (Plague) - Great for allowing u to puke on the non blocked gens and spread the infection if they dare to touch them. Plus extra time to get setup and apply pressure, a really good perk on her!
Infectious Fright (Plague) - When she has her red puke she can really snowball hard and infectious is great for this.
Discordance (Legion) - Knowing where more than one survivor is pretty strong for plague, more infections/more injuries if using her red puke!
Fearmonger (Basic Perk) - this provides near constant blindness if they're on gens, they may not even be sure of where you hooked a survivor if they aren't paying attention. Plus the exhaustion is nice.
Bonus:
Bitter Murmur (Basic Perk) if you're using the add-on that gives you corrupt purge after a gen is done.
Dont be afraid to experiment! There's not alot to use with just the basic perks and those killers but I believe this to be a very fun build when you only have what you have! Could swap out fearmonger for ruin if you need more gen slowdown, or monitor & abuse (doctor) to pair more with infectious and to make her stealthy and even more of a snowball queen.