Just a bunch of mods with a vanilla feel and some changes to make the game a bit harder.
On expanding vanilla V.E.S.H. offers expanded enchantments(Cyclic, So many enchantments), better mob farming(Cyclic, Mob Grinding Utils, Chicken Chunks), a more in-depth tool and armor creation system(Tinkers Construct, Tinkers Armory), an expanded Nether experience(Nether Ex), and quality of life changes(JEI, Reauth, Hwyla, JourneyMap)
For making things more difficult V.E.S.H. makes the world darker(Hardcore Darkness), changes ore generation to make larger and rarer veins(Realistic Ore Veins), makes mobs generally harder to kill(Rough Mobs 2), and adds randomly generated dungeons to the world(Rougelike Dungeons).
Major changes to the configs for Realistic Ore Veins(Setting up how ore would generate, mostly by increasing the rarity and size of veins), Cyclic(Removing most of the not vanilla friendly blocks and items e.g. RF machines and building wands), and Rough Mobs 2(Removing some of the more blatantly unfair mob abilities e.g. add potion effects to the player or teleporting the player) were enacted.

