Triple M stands for Magic, Mechs and Mods which is what this has! This modpack is a combination of mods like Ars and Iron's along with Mekanism, several gun mods, and Lucky blocks. It also has tons of other mods like ProjectE, lucky blocks and tons of other supporting mods.
With these mods, you can cast and make your own spells with Ars Nouveau, or you can use pre-set spells with Iron's Spells and Spellbooks. With Mekanism you can automate most things then use those resources to get powerful tools like the Atomic Disassembler. Then there are other mods for fun such as Scorched Guns with customizable guns and ProjectE which can get you insane tools all at the cost of EMC which you get from tranmuting resources you collected into others that you have saved. There are also many supporting mods that are for quality of life or just other features.