Idk what a jager is but most perfumes and fragrances actually have side effects including sinus tension, headaches, allergies etc in humans. Some perfumes are all g like vanilla but others, even natural ones can be very overpowering when concentrated. so idk maybe jagers are repelled a bit because some essential oils just aren’t good for you in concentration. Plus, actual concentrated ammonia and methane would probs repel them because concentrated and dangerous (ie: eau de toilette sewer)

iztarshi:

They’re creatures of Mad Science!!! Kind of orcs for a world of mad scientists rather than magic. They have a reputation that includes hating soap (true) and eating babies (not true).

They are voluntarily mutated super soldiers from the webcomic Girl Genius, who signed up to pillage everyone for their masters, but are nonetheless adorable.

They’re also a mixture of biological alteration, old and highly developed subculture, and playing up to their reputation as monsters that can make it very hard to tell where typically Jager behavior is coming from.

They’re immune to harm from a lot of things, so some things – like sewers – – they might fail to react to because it really isn’t dangerous for them.

I don’t know if they’re capable of having allergies, but they have a very good sense of smell, so something caustic might irritate sensitive noses.