The main mods that are used in this modpack are the following:
-SHC: PVZ ZenGarden (Grow special kinds of plants to defend bases you build.)
-[SBW] Superb Warfare (Find blueprints in loot chests to craft guns, aswell as ammo to fight mobs you encounter.)
-Zombies Reworked (Overhauls Zombies to be more inteligent and powerful.)
-Biomes O' Plenty (Adds several unique biomes to Minecraft for players to explore.)
-AI Improvements (Makes most mobs smarter than they originally were.)
-Improved Mobs (Forge) (A progressive mod which makes mobs even smarter, and allow them to use many different tools like enderpearls and pickaxes and stronger armor, INCLUDING MODDED ARMOR AND WEAPONS!)
-Scaling Mob Difficulty (Makes all mobs stats progressively increase.)
+48 Other Mods
TIPS for starting:
-Exploration is the key to finding many items needed to survive.
-Mining early on is also recommended to survive longer.
-The Crazy and Armorer Villager types are Valuable to have and to protect from mobs.
Recommended Difficulty: This modpack would be better in Hardcore mode if you play single player, but keep it on hard mode in multiplayer servers or LAN worlds.