Medallian, others have already suggested it, but I'll add to their voices. Why not try using lesser gear? Some of the lower level rares and uniques have nice enchantments on them, it would make things more varied and it would up the difficulty until BW releases the new difficulty for you leaderboard types.
I don't think capping stats will be for everyone, but given the huge spread of promotion stats, I suspect it will be hard to balance the new difficulty.
Enemies would move faster and attack faster. Maybe all basic mooks should have 3×hp, elites 2×hp, bosses 1.5×hp, archers would do triple damage, melee mooks 4-5×damage, enemies would get barrier and guard busting abilities, and lieutenant type enemies would get aoe buffs eg to attack speed. AI would be upgraded so archers would use cover, and gain leaping shot as well. Melee mooks would split up to try and flank you, or hit your back ranks. Shield guys would hang back to protect their archers. Spawns would refuse to fall for obvious LoS pulls, forcing you to attack them.
Oh, and more enemies generally.10 despair demons and 10 terrors simultaneously (ie all spawned together) in zone 4 of the castle. At least 5 venatori spellbinders per spawn.
Enemy units need more abilities. Stealth units get hidden blades. Enemy mages get pota, chain lightning, static cage fire wall, ice wall, Winter's Grasp, horror, immolate... Red templar horrors and knights get an aoe lyrium bomb attack the works like walking bomb with dot and then an aoe explosion with knock down. Pride demons get druffalo charge. Fear demons get proper stealth and damage buff, and horror. Enemy archers get a proper longshot with upgrade so they can hit your entire team round that corner you're trying to do a los pull.
Give enemies the ability to use combos, eg put you to sleep and then proc a nightmare combo, for example. Imagine if you're all grouped around a Zither, who gets paralysed and then they proc a discharge!
Dragon too easy? Triple the number of dragonlings per spawn, and quadruple their damage. Introduce drakes and mature dragons in the spawns as well; it would be like a mini dragon fight while the high dragon is taking a break to fly around. If you don't kill them in time, you have to deal with them while the dragon is landed. What the hell, make them spawn continuously throughout the fight, so your entire party can't just gang up on the poor high dragon. Double the dragons HP, quadruple her damage output, reduce the cooldown on her guard generation and her aoe rune attacks. Increase her attack speed, and make it so she doesn't telegraph her melee hits so obviously and slowly.
Er... I'll stick to perilous, thanks.
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GreatBlueHeron et Zantazar aiment ceci