Anyone else getting "archive is corrupt" errors when downloading the 1.4.2 server files through the FTB launcher (unzipping with WinRAR)? It seems to be having an issue with Blood Magic's jar file.
On another note, regarding incentives to play through Twilight Forest: I don't think you need a quest section for Twilight Forest, as the progression mechanics within the mod create a quest line on their own (though a brief "enter Twilight Forest" --> "craft Twilight Map" sequence in the Remembering chapter, much like the current Nether quest, would likely be a good idea). Instead, how about altering crafting recipes to make Twilight Forest progression a prerequisite for advancement in other mods?
There are a ton of flavorful Twilight Forest items: the metals progression (Ironwood, Naga Scale, Silverleaf, Fiery Blood, Knightmetal, Carminite), natural worldgen (Fireflies, Torchberries, Raven Feathers), and even decorative blocks (Naga Stone, Tower Wood). Any of these could be modded into existing crafting recipes to make Twilight Forest a necessary part of progression through Hubris---much as the Terrasteel requirement for the Blood Altar gates Blood Magic behind Botania.
The really cool thing about every single item I've italicized above? Acquiring each of them presents a unique gameplay experience that would spice things up at any stage of the game (Fireflies and Torchberries early on, Carminite towards the end), while making the Twilight Forest an integral part of Hubris rather than a convenient place to find Botania flowers and (those frakking absurdly overpowered---I mean, whoever thought it was a good idea to make whole packs of them spawn with infernal/special buffs needs an icepick lobotomy, administered slowly) wolves.