With all the creepy crawlers and such I think it'd be cool if a few 'stuck' to the pc a bit more, I have a few interesting ideas too! (tell me btw if some of this stuff is ingame and I've just not found it yet).

> External abomination markings that you get similar to how piercings and stuff work. Could only start showing up after you've been snagged into the breeding chamber and gave birth to an abomination

> Abomination Clothing. Living creepy crawlies that you can snag from the seedbed areas after breaking out. Also could be the things you give birth to after being seeded by the abominations, your 'children' climbing onto you and latching on. Could potentially have them apply negative stats until the pc has been internally seeded at which point they'd give mixed stats. 

> Abomination questline for Elise (or another npc perhaps)  that opens up some abomination themed gear and such. He might be interested in having a cooperative subject who's been subjected to the abomination seeding for a time...

> Traits/abilities based on abomination status effects, permanent changes to Lona's internal workings the longer she goes without getting the seedbeds inside her removed. The few ideas I have right now would be: an ability to spawn some of the little larva looking enemies on command; a trait that lets Lana find 'food' in abomination areas (would probably need one of the skill traits to eat one happily); internal organs start getting mutated and eventually replaced as the affliction works its way into her essence

These are just some ideas I had and I might post more later :)

like, mama boss?  I guess it will have a big positive but also a big negative, as well on the user because mama's boss's whole speech on 'she the only one who can use it'.  and also, on a combo of a Level 99 Abomination Lona with the right skill and points. it will be like a full-blown monster! and now I'm wandering because of the abomination Lona with this hypothetical armor? will it just be like a whole mind fuck for abomination Lona? it will probably encourage Lona to kill more, right? and it will probably change Lona's whole mindset and just be a psychotic killer. so, Lona has to pull that armor out like a last-option sort of thing? Maybe the armor acquirer lactation to sustain itself? not sure but I like the idea for it!!

Maybe sort of like berserk where it gives more attack and defense, but maybe like it takes your health constantly
Which you can restore by either killing stuff and having the armor eat them, or just health potions I guess
And also ike instead of an armour slot, it's like a side slot or something, which gives you a skill you can use to switch in and out of the form.
And to make sure the player isn't too OP early on t'd be like one of those things where you have to finish the Big Mama and Elise questline to the end.
Then maybe need you to like go into Sybaris to require some special abomination or something, which also needs the help of Lisa and her explosives so you need to finish her questline too.