Damage is determined by depth. The deeper you are, the more damage you do.
Everywhere in the game, every room of each depth is constant, EXCEPT for the top left trojan room in d25, has been this way since beta, we don't know why you do less damage in that room, it's quite idiotic though.
I have sent countless bug reports SINCE BETA about it. Lul.
75*1.1 = 82.5
So it seems poison wouldn't cause this. The only thing I can think of is you have some sort of damage boost vs. Undead and were actually hitting Jellies and/or Trojans in the top left room.
Edit:
@Chris' response: Interestinggg
The defense of slags down there vary. The ones in the jail room in D25 are pretty notable, as the difference is comparatively more noticeable.
I recently recorded some T2 fiend bombing, and I had single bomb blasts that were doing different amounts of damage to two devilites who were standing right next to each other. Figure that one out.
so i did a FSC run and paied attention to hits in D24, 25 and 26 but forgot to do so after that
at D24 i was doing 102 to all zombies when using charge attack
at D25 i was doing 99( 3 damage less than D24) to all zombies except the ones in the top left room, i was doing 79 this time, not 75 as some other previos times
it seems its really bugged and my gun had nothing to do with it, i will check if using diff weapons also reduses 20 damage or no
at D26 i was doing 96( 3 damage less than D25) to all zombies
thats really weird, i also got pics of it, cant post them now tho, will do as soon as possible
and no there was no poison, and i never had trinkets plus i always wear Skolver set as its my only 5* set, and the gun is Lvl 10, u will see the pics by urself soon enough
The explanation is because Strike Needle is a 4* weapon. From some damage tables compiled on the wiki (like say Ascended Calibur), the damage of 4* actually dwindle the further one goes in the 6th stratum.
hmm, that makes sence, coz i remember having a perpule dot near the map when i was doing FSC in 4* gear
EDIT:
wait, i just remembered, the normal hit always does 53 damage each bullet in all levels in FSC, never seen it doing less or more, and im sure it was also doing 53 on the top left room of D25, gotta check it out in my next run
i think it is because
ENIMIES
HAVe
defense
like more shadow def. of more piercing def!
1!!
1
so it you have like 2 zombies and you do more dmg on one zombie...
then...............
that zombie is a "higher level" or whatever you call it.
ok the screenshots r now up
http://steamcommunity.com/profiles/76561198047605449/screenshots/
@ Andy: it always does the same damage to all zombies in the same Depth, and it gets redused by 3 each lvl i go down, instead of doing more damage as i go down
Voleb's explenation makes sence, but Ascended's charge always does the same according to wiki, its only the normal hit that goes down, maybe the opposit is the case for Strike Needle? Constant normalhits damage at S6 and Charge damage gets lower each depth down? And each 4* weapon has either the charge or the normal hit constant and the other gets lees the deeper u go? Well i have 6 4* weps so i can test that with them
Friend Poisoned enemies?