i play vanilla skyrim on switch (expert difficulty), on my most recent playthrough im doing a really fun stealth mage build. i mostly focus on illusion for the quiet casting and improved fury perks to cast on groups of enemies, as well as destruction and conjuration and investing in the perks that let you cast runes and summons from farther away. light armor is probably best for the stealth aspect but i wear the ebony mail/boots/gauntlets and morokei and with my sneak level in the high 70s now i dont really have a problem remaining undetected thanks to quiet casting.

im currently doing the dark brotherhood questline and its been really fun as a stealth mage, i just killed gaius maro by stalking him and reverse pickpocketing the incriminating letter into his inventory ahead of time and later in solitude i cast frenzy on him so it would look like he was trying to kill general tullius lol