Hello, can someone tell me what bonus as forsaken I should try to get, I'll be honest, I don't really understand what thing like "+ victim inju damage as forsaken" or "gain own expertise by impregnation" mean.
I'd suggest
this post for a basic rundown of the thought processes for how to use and train Forsaken.
For the bonuses you are referring to, those are bonuses unlocked for setting a Forsaken in one of the four Punisher positions (Breeder, Hypnotist, Harvester, Publicist). These bonuses have a wide variety of effects, but all of them are activated by having the Forsaken capture a Chosen that is prepared for a Tier 4 Vulnerability Break (so 1000% effectiveness at the start of a campaign). When you capture that Chosen with a Forsaken in the correct Punisher position, a move will show up on that captured Chosen that will allow the Forsaken to do the Punisher move.
I'll repeat because I know that there's a lot of information in the last few sentences:
1) Set a Forsaken to a Punisher position using the Positions button
2) Use any means to get one of the Chosen you are currently fighting up to 1000% Punisher effectiveness (this is when Tier 4 breaks are ready to occur, the Info screen will say "Capture with _____ Commander for that Circumstance)
3) Capture the Chosen with the Forsaken that you set to the Punisher position
4) Use the move that shows up the turn after capture on the same Chosen.
So now that we know how to get these bonuses, what do they do?
"+victim" means they create a permanent bonus for the Chosen (later a Forsaken) that they use the move on. So "+ victim INJU damage as forsaken" means that the Forsaken created after the loop will also do bonus INJU damage (assuming you convert her during the final battle).
"own" means that the Forsaken in the position gains a bonus. So "gain own Expertise by Impregnation" means that this Forsaken, if placed in the Breeder position, will gain Expertise (basically ease/speed/effectiveness of training) each time she uses the Impregnation move, which is the T4 break associated with Morality/HATE. This ability can be "stacked up" and will grow more powerful the more Chosen that this particular Forsaken T4 breaks in that way.
Other ones I see that might be difficult to understand:
"-victim (corruption stat) as Forsaken" means that the Chosen/Forsaken that receives that T4 break from the Punisher Forsaken will have the amount shown subtracted from that Corruption stat. For example "-28% victim Hostility as Forsaken" means that the Forsaken will have 28 subtracted from her Hostility value.
"-required Effectiveness for (T4 Break)" means that this Forsaken can use the associated T4 break move at lower Effectiveness levels--the move will show up below the regular threshold of 1000% (can be lower with Achievements).