An enchanting mod that lets you enchant items with artefact levels of power, but you really have to work for it.
Right now I'm emulating this using the Disenchant mod by adjusting its settings so that the disenchanted item gains enchantment capacity equal to the enchantment that was previously on it, meaning that repeated enchants and disenchants can raise capacity for that item until you can make something good, but it feels a bit too "I will upgrade this later." I'd much rather have a mod that lets you work to prepare an item for a major enchant over time with ongoing investment from spells etc, maybe sinking your magicka into it with temporary drain, done in a way that requires you to really plan what you'll be enchanting.
This has the side effect of making that fortify intelligence and enchanting loop actually matter for the final enchantment. The increased power of the enchanted effect means even with 'cheap' tactics, you might fuck up.
This was inspired by deciding the Archmage's robes from that robe mod was ugly compared to the master level robes and wanting to figure out how to enchant something of equivalent stats. Speaking of which, the ability to enchant Fortify Maximum Magicka as a constant effect on robes or staffs would be good (I got another mod to add an equivalent effect, but it can be placed on anything on cast, which feels supremely busted).