A Few Delve Fracture Questions

Been having a hard time finding specific information regarding Delve. There seems to be a lot of outdated information out there. Just need to know a few things:

1. Delve difficulty supposedly scales with the number of people in your party. I have heard from some sources that this only effects the boss's HP, but others claim it affects their other stats. What are the details regarding this?

2. I have often seen groups enter delve with 7 people. Do Delve bosses scale with specific numbers of players per group or does each individual person who enters affect the boss's stats?

3. Does the number of players in your group effect *only* the last boss, or does it effect all of the NMs therein?

Each additional person over 6 members adds HP% to all NMs (possibly fodder as well, idk). Doesn't affect other stats.

HP only, +67k per player (or somewhere near that I think) above 6 people, and I believe all nms are affected but not NQ mobs

edit: I'm slow. the 67k was with regards to mega boss

All nms are affected. A clear example of that is krabakarpo, that with full hp is one the worst nm in foret.

Thanks for the replies. I'm guessing based on this information that it's not a really good idea to do it with less than 6 players. The hard part now will be finding enough competent players to do this with who aren't already tired of doing it.

Extra bodies affects HP (and only HP) of all enemies inside. Incursion has the same rule, and I've noticed in both having done things that normally one-shot enemies not being quite enough. Supposedly each person adds something in the order of +1/6 of their max HP (from a 6-man run), though I've never actually measured.

Honestly, going in with more people isn't a detractor, as long as those people can carry their own weight. the great thing about 6-8man groups is that a lean group with quality players can breeze through the content quickly, and with appropriate buffs, avoid some of the TP spam from certain mobs. Krabakarpos mechanic is that it gains damage resistance to the type of damage which you're dealing over time, and can become almost invincible if you take too long. the lower HP of a small group makes it easier to hit that number more quickly, but even with a full alliance, if people are competent, it should just mean popping formless for last 10-20% or using requiscat, or other ignore def ws.
The real problem with taking a full alliance now is that you have to find people who can contribute enough to be worth bringing. That is enough of a challenge to fill a 6-8 man party right now outside linkshell groups.

you can still win with 18 people with a 6 man team that can win (12 buyers)

If you can find 12 buyers for old delve, sure.