Some of the wiki tables were not updated after the May gun/bomb buff. In some cases, they were blanked, but then never filled in again. Also, you might want to look at the history of the Blight Needle page, to see whether it was updated; its information might be wrong.

The key edit is 17 June 2012 by Trying, with summary "updated damage table". Trying is/was a major wiki contributor, and that edit completely changed the damage table, and it came after the gun buff. So those numbers are probably up to date.

The damage numbers should come from non-poisoned monsters, unless there is a note saying otherwise.

Edit: I see now that Trying removed the damage numbers on 19 June, due to an error. Too bad.

"btw does dmg when poisoedn should also be told or just the plain dmg?"

Poison increases all damage by the same amount (percentage). All we need to know is this single number.
Repeating the information would be unnecesary.

I would contribute more actively, but it's rather confusing given that certain monsters seem to have higher resistances to damage than others in the same family. For example, Deadnaughts seem to take less damage from my Plague Needle than the standard Zombies at the same depth in LoA; should I be checking the damage values for every single monster subtype, or just for the most common family members? Because if it's the former, it's going to be quite difficult to get values for each depth...

Obvious and easy alternative is to standardize all the damage values by using the weapons on the new training dummies available in Guild Halls. I'm not sure how well that would work, though, given that it wouldn't be a valid representation of the weapons over two stratums.

I had heard, I believe from the wiki, that blitz needle will always do more damage, even accounting for the poison and a other teammates. But I'm not willing to grind for tokens just to test it.

Yeah, the Blitz regularly does about 100 more damage or thereabouts than the Plague, even whilst taking the poison into account. It's only reasonable when the extra damage from the Blitz with poison makes up for the lack... or if you're getting damaged quite a lot.

Some damage tables are for level 1 weapons, some for level 10 weapons.

Really? All the ones I've seen are for heat level 10. That seems to be the standard, maybe because it's easy to keep an item at heat level 10, but hard to keep it at heat level 1. But I haven't surveyed all of them recently.

The numbers below are for the t3 Training Hall, since the lower tiers aren't really relevant to the question; I'm not entirely sure whether it equivalates to stratum 5 or stratum 6 values, however.

The Tier 3 training hall is at depth 23, officially. This information should help you compare the training hall damage numbers to the wiki damage numbers. For example, for Blitz Needle, regular shots, at heat level 10, damage bonus+0, against neutral enemies:
* Depth 22: 57 (from Blitz Needle, stratum 5 maximum)
* Depth 23: ?? (whatever you get in the training hall)
* Depth 24: 62 (from Blitz Needle, stratum 6 minimum)

@Hariender
Sure, not much difference in raw damage, but look at the strength of the status. It become stronger, resulting in it being able to deal more then blight, when the targets are poisoned. It also increases the blitzes damage, to, if I remember right, higher then 4 blitzes

I would like it if people stopped saying that poison works the freaking same no matter the strength of poison.
I forgot the percentages, but I did a test earlier with Strong vs Minor poison (Weapons used: Plague Needle, Venom Veiler). Strong does about 26% more damage, Minor does somewhere around 22%, but I'm not completely sure about the exactness. The point is, Poison IS Not the Same.

I'd upgrade to Plague for the status effect boost. Ultimately, if you are going to be using your Blight for Vana and not going to pickup a Blitz, I believe you might as well upgrade. It's a personal preference whether or not you want that damage and poison boost. (I personally am not upgrading my Vile Striker because there is only a damage boost, no status effect boost)

It is not "certain monsters" that have damage resistance, rather an Area has total damage reduction. If you always have damage numbers up, you can figure out these places. There is one at the end of LoA, one or two in D26 FSC, to name a few.

Plague Needle is supposed to be for the poison effect, I hope that it gets a higher proc chance of poison, along with the DVS. Plague Needle and DVS have same proc chance of poison for the same effect of poison, but Plague ultimately hits more often while using the charge. So the poison aspect of DVS is diminished due to not hitting as oftenly to proc poison. I would give up Poison strength for proc chance increase upgrade for Plague Needle and DVS should have a free proc chance increase because Vile Striker has the same proc chance and poison effect.
A demonstration of how meager the slight chance is on Plague Needle, is when blanketing a crowd of zombies with a charge attack, usually nets 0-3 poisoned zombies, I'd take out Plague from that name, it doesn't deserve that moniker.

I wanted to re-run the test I did a few months ago (probably outdated by now, here is the link, comment 30 : http://forums.spiralknights.com/en/node/35702 ), but I didn't find a willing Plague Needle user yet.

As an aside, what's to consider :
- in which cases Blitz will be able to OS things while Plague will need at least 2 charges ? (thus 2x times, regardless of specific DPS) : I'd argue, a lot. Trojans and zombies, which amounts for the most part of FSC.
- in which cases is Plague's poison being to be actually useful ? Considering the low chances of poison, the low effect of poison and the fact that things die so fast, I'd argue : not a lot.
- when in prolonged DPS (= Vanaduke), how much Blitz do you need so that N Blitz + 1 Plague > N+1 Blitz ? I need data to determine that. I don't think it evolved a lot since my last calculations (which was even heavily skewed toward Plague).

" the Blitz is just so obscenely powerful that most things pale in comparison to it"
I agree totally with that statement.

Shoot me a friend invite, I have the same in-game name as forum name (tried to pm you 2 times but you were offline or don't use the same name). Else I know of 2 persons who have one, but I have the same problem with them : hours.

"since it was a percentage increase, we all know what that means, right?"
No, I'm dubious of percentage increases, because there may be some roundings or some details or something (for example, it is often assumed poison is 10%, but it's not, same goes for damage increase from DB etc....). I prefer to test it to be 100% sure.

I did some testing while chilling in a random Guild Training hall against those practice punching bags. All these numbers were against a Beast Punching Bag, and both guns had the same damage bonus (Damage Bonus High via Trinket and 1 piece of Chaos for the CTR).

Plague Needle Charge:
- Poisoned: ~206 per shot
- Not Poisoned: ~197 per shot

Blitz Needle Charge:
- Poisoned: ~275 per shot
- Not poisoned: ~263 per shot

The Blitz needle got ~+12 damage from the poison. The Plague Needle was ~60 points of damage short of a Blitz.

4x Blitzes (No Poison): ~1052
3x Blitzes + Plague (With poison): ~1031

These are rough numbers, but to me it seems that even with 3 other Blitzes, the Plague is still inferior to the Blitz. Now the damage difference is not too much, so you can debate other benefits from poison could potentially outweigh the damage difference (Counters Healing and reduced damage).

OK, I was wrong about the poison bonus increasing damage enough >.>
Oh well, just as well I've got a blitz and a plague, which until it's buffed, probably isn't going to get used. Pity.