Jesus cribblyhumping christ.
I hit super hard mode on the dark souls mod. Yes, it has something beyond hard mode.
1. The wall of flesh equivalent for hard mode was somewhat crazy. I think. There was so much crap flying around the screen I was probably getting <5 FPS. What I was seeing was pretty glorious, though. Also. Multiple forms. Not only multiple forms, but it is in fact two different bosses, each with multiple stages. And unique sub-boss... things. One a suped up wyvern, the other a mage-y thing.
2. The weakest SHM critter I've seen so far (out of two... three, technically) has 17k HP (well... okay, the other one summons buffed up chaos elementals that "only" have like 3.5k, iirc). Can teleport like chaos elementals. Has at least three different projectiles, one kind of mage-ball-y, one a massive chaos-flame breath of doom thing, the last a homing doom missile of some sort. Can inflict poison, bleeding (no regen), confusion, cursed flames, curse and... some other debuffs, too. Each on different attacks. Hits like a goddamn truck. Bloody freaking insane.
3. General performance has degraded so badly I've been pretty much forced to resort to hacking the game to just to survive, as I can dodge goddamn nothing and even with >150 defense, massive health regen, and 300 hp healing potions I cannot tank basically bloody anything anymore. So many projectiles. And/or enemies. If it's not spewing a bazillion bits of dakka at you, it's summoning horde of friends. This game has gone freaking Touhou on me.
... I'm definitely kinda' enjoying myself. Would recommend.