For a moment I was laughing then I realized you didn't say word bearers.
If Commoragh is truly compromised, and their knot of the webway is cracked open to the immaterium, Slaanesh will beat everyone to the punch and devour it all. But if it's a small enough hole, the drukari can plug it after carving a path. Or at least start bailing before it's all lost.
I didn't see anything about knights.
One of the largest knights. There is one class bigger though.
I read somewhere that the devilfish used to be a nightmare with its rules. To the point that players would leave it out to play fair, or at least not easily wipe the floor with their opponent.
One of the reasons why no one has ever successfully assaulted Commoragh in its entirety is that it's crazy massive, and densely populated with pretty much ALL the Dark Eldar, and it's a place that makes which makes underhives look like safe places to live.
So at minimum we are talking about having to carve a path through hundreds, probably thousands of miles of urban combat, with the highly lethal populace being armed with a horrific variety of ways to kill you painfully, or just make you suffer. Just for one strategic target. Oh, and did I mention they feed on pain and suffering? Having as many different ways to painfully end you is actually a necessity. I often forget to mention them in the "advancing" category, but they do still actively experiment, and giving them fresh incentive means that even Daemons would have trouble cutting through to any strategic targets.
This is honestly more personality for the Khan than I've heard before.
I know Typhon is a favored servant.
Or they'll take over after everyone else kills each other off.
The Tau are the only ones who haven't fallen and decayed. They also aren't worth the effort of the chaos powers.
Joke's on you walking pus bags, negligible warp presence. Also better living conditions than the Imperium's rot.
They endure. At least that's what I've heard, and they're scarier in lore.
You can't just lump the Aliens in one group when talking about factions. There are 5 different major alien species, and two of them have individual faction within their race/nation.
I'd say browse around or tell us what you're looking for in a faction.
Shot, scoot, and stay behind the Kroot.
Tau are very mobile and have weapons with superb rang and yield. Just don't forget you can also use the Kroot as meat shields who hit back pretty well.
Oh, and if you can afford the models... you have hover ramparts for true mobile defenses. Because the Tau were the only ones innovating.
It depends on criteria. On the one hand, the Guard has people who know they're screwed, but fight one for the cause. The Custodes are usually going to be the most lethal, efficient, effective, best armed, etc, but I would expect nothing less from them. They also lack independence and individuality. Astartes strike a nice middle ground in a way, but they're so super awesome by design, and their heaviest vehicles seem to surpass the equipment of even the Custodes in raw power, though not quality of make.
It's really hard to say since different people have different metrics to determine awesome, and sometimes they are in conflict.
I feel like Grey Knights are at the bottom for me though, with the Adeptus Sororitas coming in second to last. The Sisters of Silence come in the middle overall for being an unknown to me and hyper niche.
I'd be willing to bet that some of the other first founders have some in deep storage. They either just forget about them (like writers) or they're so deeply sealed that by the time they realize they should break out the best reserves from the gear cellar, the fight will be resolved before they finish reactivating them.
Oh, Mephiston, the 30k era actually had an Astartes tank that's basically a meaner Shadowsword. Some relics still exist.
It's called the Falchion.
I assumed that went without saying, and we started by talking about which baneblade connected tank was the best. Expensive is kind of a given.
If you mean that all the superheavy tanks in your army are Baneblades, that could possibly work. Making an army with just Baneblades not only lacks specialization, but makes it outright rigid. And enticingly slow.
Without specifics on both enemy and allied units and tactics, it's hard to say. The wider Baneblade family is mostly made of specialized designs. The "normal" baneblade itself is probably the most versatile of bunch, albeit with no particular area it excels at.