Illusion magic builds that don't feel completely useless by midgame?

I keep trying to make an Illusion mage work on my Switch playthroughs but by level 25-30 it feels like enemies just shrug off everything I cast. Fury and Mayhem are fun for like two seconds but then I'm just standing there watching. Does the tree get better with specific perks, or am I better off pivoting to Conjuration? What am I missing here?

Illusion gets way better once you hit the perks that matter, but you're right that the early-to-mid stretch is rough. The issue is that by level 25-30 on anything above Adept, most humanoid enemies have high enough magic resist that your spells just bounce off, and the AI breaks out of crowd control too fast to matter.

Here's what actually saves the tree: the perk that makes spells stick longer on targets, and the one that makes your illusion spells affect higher-level enemies. Those two together turn Fury/Mayhem from a two-second gimmick into something that actually controls a room. You also want the quiet casting perk because casting an obvious spell in combat gets you rushed immediately.

The real play though? Stop trying to solo-carry with Illusion. Pair it with something else - Conjuration is the obvious choice since summoned stuff buys you time while enemies are confused, but even Destruction works. Cast your crowd control, let your summon or your damage spell do the heavy lifting, and suddenly Illusion feels way less useless. It's a support school pretending to be a primary damage dealer, and that's where it shines.

On Switch you're also stuck with vanilla scaling, which is harsher than SE/AE for magic builds in general. If you really want to make pure Illusion work, you might just have to accept it doesn't peak until later levels. But honestly? Conjuration branch is probably less frustrating for what you're describing.

That's solid advice, but I'd push back slightly on the "support only" framing. Illusion can work as a primary tool if you're willing to play differently than a typical mage.

The thing nobody mentions is that Illusion scales with enemy level in a weird way. Those spells that won't land on a bandit chief? They'll still wreck a dragon priest or a high-level mage because those enemies usually have lower magic resist than you'd think - they're built around different threat profiles. So you hit this weird sweet spot around level 40+ where Illusion suddenly feels broken in the opposite direction.

On Switch vanilla though, yeah, you're eating the full scaling penalty. If you're set on making it work before level 40, the quiet casting thing is genuinely non-negotiable. Getting rushed while you're mid-cast is the real killer, not the spell failing - once you can cast without breaking stealth (or at least without getting immediately charged), you can actually chain spells and manage a fight instead of standing there watching.

Also: are you using any of the utility spells? Invisibility and muffle aren't flashy but they let you control when combat starts, which is half the battle with Illusion. You're not trying to win a slugfest; you're trying to pick the terms of engagement. Cast invisibility, reposition, hit them with Fury while they're confused about where you went. That playstyle clicks way better than trying to Mayhem a room and hoping your summon survives.

Conjuration is still probably the path of least resistance though, not gonna lie.