Endless Abilities lets you spend experience to get perks, as simple as potion effects, or as advanced as flight.
Every player starts out with the ability jar that contains one random ability, and enough experience to activate it. You will lose 1 of your perks on death as a trophy, as long as nobody steals it before you get there you will have to pay to reactivate it again. You can also get new ability trophies randomly by killing enemies that have yellow sparkles around them. These abilities are random, but once added to your character they can be manually removed back into your ability jar so you can mix and match as you want.
Now onto the actual description:
Explore and adventure for new foods, animals, and flowers to grow.
This pack focuses on the natural world, with just a hint of technology. You'll find tons of new foods to craft thanks to Pam's Harvestcraft. Botania adds some magical options to your flowers, from basic enemy repelling items to swords and wings.
On the technology side you have Forestry to allow you to autofarm. You'll be able to breed bees, and trees, and produce butterflies thanks to Forestry, which can do everything from giving delicious honey to gorgeous new woods to build with.
Also included is Roguelike Dungeons providing interesting dungeons for you to explore containing unique equipment, and challenges for exploring while you're waiting for your harvest to come in.