Most of the mods in the modpack are based around the Tensura: Reincarnated Mod, unlocking skills, fighting strong bosses, and resetting it all to get stronger on the next life.
The progression in the modpack is based solely on killing mobs from Tensura: Reincarnated, Minecraft, or Ice and Fire.
No need to worry about dying and dropping all of your stuff, this modpack includes Your In Grave Danger, which leaves a gravestone where you die, which keeps all of your stuff safe until you return.
If you need extra storage and the skills and magic from Tensura: Reincarnated aren't enough, you can use Iron Chests; you can learn to craft those using JEI.
All that's left to learn now is how you can play Multiplayer. By using Essential, you can host your worlds and invite your friends to play with you, and with Simple Voice Chat, you can even talk in-game using your microphones.