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Well, here I am again. Turns out I really like this whole Homebrew thing! So, a couple years later... I have written quite a few interesting classes, items and races! I think I've chosen 3.5 as me forte, despite possessing only 4.0 books. Here's some of my favorite contributions:
Earth-Bound: One of my first classes, and also quite complex. Not fully polished but I think it's pretty cool.
Battle Chemist: Basically a casting variant that uses science instead of magic. Took a lot of effort, still incomplete mixture list, but is awesome and will be even more so, in my opinion.
Mechanus Knight: A nonmagical, steam powered behemoth, improving through innovations in their technology.
I'm also making a lot of classes now, that are amusingly interesting, mechanically. Want to be a rogue that coats the room with images? Want to fight by tactically analyzing the room instead of going THOG SMASH? Want to impress the townsfolk with a huge, Good-aligned avatar of yourself floating above you? I'm your guy! Some of these are purely stats. I'm taking suggestions! If you have a request or an idea, drop it in discussion. Note: I'm good at making up mechanics. I'm not so good at balancing them without playtesting. If you plan on using any of this, check with your DM. Also, if you balance it pretty well, feel free to tell me about it, so I can make the change on the class's page.
Aligned Warrior: A holy warrior that uses alignment-based powers to augment his abilities.
Echo Warrior: An agile warrior, using residual images to assist him in combat.
Pyromaniac: A fire-based casting class, burning spells for fiery powers.
Calculated Warrior: A warrior that uses intellect and skill to fight with calculated precision.
Avenging Barbarian: A barbarian that uses vengeful fury to power his strikes. Not really polished or balanced.
Incarnator: A master of grafts, creating them and using related powers with unparalleled expertise.
Statistics done, flavor incomplete:
Specialist: Don't feel like optimizing and/or breaking the game? Give melee nice things in a chosen specialty with this class!
Frost Knight: A gish glass that grants ice based martial benefits while advancing spellcasting.
Abilities done, filling incomplete:
Doomblade: Worshipers of the Doomblade.