Custom-curated pile of mods that are primarily focused on creating a campaign experience that's slightly inspired by Long War. Tuned for playing on Legend. I haven't run into any incompat issues yet, so I'll label it as "Items that work together".

XCOM feels pretty strong earlygame, but the Aliens come back in the midgame to break your kneecaps and take your money. Good luck. If I'm convinced XCOM's too powerful overall, I'll likely install the mod that causes the Force Multiplier to scale with the success of XCOM to try to balance things out. There's also options like reinforcements being able to take initiative. My goal here isn't to nerf XCOM, but instead to buff aliens. I want ♥♥♥♥ to get wild here. If the Aliens get too strong come lategame, I'll counter by offering Squad Size +3/4 to XCOM.

I haven't tested with the increased starting soldier count, but I recommend installing the mod that increases mission frequency as well if you're starting a fresh campaign. Pushes things a bit closer to that Long War experience.

There's a fair amount of bloat in enemy types between ABA, Spectrum: Enemies, and the newly released Long War Enemy Pack, so I might cut out one sooner than later. Probably Spectrum.

The cosmetic section can be a bit chaotic, but there's a rationale to it. Most Halo gear (except helmets) will only work with each other, but there's room for some experimentation. I'm trying to stay away from goofy/out of context looking cosmetics or voice packs, so I'm being pretty stingy with it. Unfortunately, one of the mods installed adds a bunch of dumb masks, but it's luckily tucked away at the bottom, so you'll never see it.

Either way, I'm having a blast with this.

HOUSEKEEPING NOTES:
The first time you boot, there'll be a ♥♥♥♥♥♥♥♥ of warning notes stacked on the left side. Don't worry. Reboot the game, there'll likely be a couple more, reboot again, and you're set. At least, it works for me.

I'm hearing reports from some people that they're seeing performance impacts from something installed via this collection. Can't really tell you what the source is at this point in time, just something to keep an eye out for.

Randomly generated troops have a chance of spawning with invis limbs if they generate using some sections of the Halo gear, which are intentionally left invis. Just go into the customization menu and fix it.

Beware using Commander's Choice to assign a SPARK class to a human; it can break things in some strange ways. If you do so accidentally, you can swap the class back and revert customizations back to character pool and the rigging/model should correct itself.