Wither Storm Enhanced is a simple challenge modpack based around Cracker's Wither Storm, with performance improvements, shaders and a couple extra mods. To preserve the challenge, the only mod that changes vanilla content is the Wither Storm mod - the rest just help the pack run better, with optimisation and visual improvements, in addition to free multiplayer support through World Host.
Host your own Server
If you're interested in playing Minecraft (with or without my mods) with your friends, I recommend you take a look at Kinetic Hosting!. For 5GB ram, they charge under $13USD a month for Performance, and under $6 for Budget, not including my discount code! I personally use their performance servers, and their specs, price, support and easy-to-use panel are the best of all the hosts I've been with. In addition, you can use code LEGACY for 15% off your first month!
More Info
Yes, I am partnered with them (and a member of their feedback team), but as an already-existing customer of them (and have paid and still pay for their servers myself), I can legitimately say they're great, regardless of whether I'm partnered with them. They're just genuinely good, I know the support team, they're super friendly and quick. The server specs are as good as you can get, and importantly, they aren't overpriced, unlike other hosts - in fact, they're less than half the price of quite a few big competitors I've seen around here, with no downside! If you need a server, these guys truly know what you're doing, and will respect your wallet when they do it. If you buy a server through my link, you even help support my work!
External resources
Project members
Rebel459
Owner