>>113727Illusion schools aren't all that bad. It's an entire school of magic, and Illusionists/Beguilers get access to almost all of them; often so potent that enemies at epic level only have some immensities (mostly just the deific ones) because they'd be too easy to defeat otherwise.
There are a lot of illusion spells at every level that are effective and useful in pretty much every adventure. Rainbow patterns, Silent Image, Persistent Image, Ice Assassin, Mirage Arcana, Superior Invisibility, Seeming, scintillating pattern, Mirror Image, Project Image, Shadow Walk, Silence, Seeming, Ghost Sound, Major Image, Nightmare Terrain, Weird, Greater Mirror Image, Phantom Battle, Shadow Well, Sensory Deprivation, Hallucinatory Terrain, Shades... etc. Some may not work on some deific abominations who have explicit immensities, but a lot of illusion spells are potent dragon-killers.
For a spellcaster, being able to confuse, delay, slow, hide from or incapacitate an enemy is often more useful than just blasting them with evocations (fireball is overrated), because an enemy at 1 HP is just as dangerous as an enemy at 1000 HP. Being able to hold an enemy still for even one round is often more valuable than just damaging them. It's certainly better than being a tier 5 Fighter, who would instantly be made irrelevant by Summoning and Polymorph spells.
Beguilers also get a lot of good Enchantment, Abjuration, Conjuration, and Transmutation spells, like Haste, Mindblank, Glibness, Dominate Monster, Misdirection, Heroism, Blink, Vertigo Field, Legion Of Sentinels, Swift Etherealness, Fog Cloud, Detect Secret Doors, Mage Armor Sending, Telapathic Bond, Repulsion, Freedom Of Movement, Incite Riot, Time Stop, Power Word Kill, Demand, Spell Turning, Greater Dispel Magic, Break Enchantment, Moment Of Prescience, Arcane Sight... etc, and they get all of those good ones without needing to select them. They also get a lot of rogue-like stealth and deception skills (a Beguiler with maxed out bluff and Glibness can fool even a deity with Divine Insight), and class features and bonus feats that allow their illusion and enchantment spell to affect monsters that would normally be immune. It seems as though the main thing this party lacks is stealth, so a beguiler would fit the niche better than any rogue ever could (they're Int-based, so they usually get more skill point per level than a rogue does anyway). Their illusion spells can be made even more potent when backed up with the almighty bluff skill, since enemies might believe your figments even if they make their saves.
Yeah, yeah, this was an excuse to geek-out about Beguilers being my favorite tier 3 class, sue me. It's all true though. Illusions are underrated and lots of fun.However, if you think it's too annoying to get a hang of the meta to make a lvl 25 character, when you've never actually played 3.5e before, that's understandable
(I'd gladly help, but I don't want to force you). On the other hand, 3.5e at lvl 25 is pretty much the same as it is at lvl 25 works about the same way it does at lvl 5, except the monsters are tougher and the party gets capable of more shenanigans: it's kind of like an MORPG in that sense where everything just keeps scaling; and it's moreso harder to balance as a DM than it is to play, since arcane spellcasters quickly become demigods while fighters lag behind (barbarians and martial adepts are good though). The worst case scenario is that you just die repeatedly, in which case my PC could bring you back to life every time without even losing levels or constitution.
I really like your character though: the shy but talented illusionist idea sounds pretty cool. Hope to see you again some time, even if it's just lurking commentary.