Alright, let's get this started!(in no particular order)
1. The Barrel Bomber
To win any fight, actually carry in barrels from other locations and detonate them. Multi-chain explosions make quick work of anyone.
2. Choice Vendors
Every time your character levels, the vendors change their inventory. This means you treat them like treasure chests that charge you money. Just reload before checking their inventory. Each level over 12 or so, you should tour the entire world of vendors to buy and sell.
3.Orange you Lucky Equipment
You can get orange level items early by traveling to other zones and accessing their vendors. Remember, level restrictions don't apply to a lot of equipment. You can use a level 20 ring at level 1.
4. Stairmaster Stats!
It works like this: you want something that has high STR requirement, say +3. But you can't equip it. So you equip a ring that gives you +2 and a necklace that gives you +1---then you can equip it, and REMOVE the ring/necklace. This is how you turn your mage into a tank mage. Mine went from Str 7 with a robe, to STR 15 with a sword, shield, plate armor, and over 100% resist on everything.
5. Skullified Weapons
Those glowing little skulls give you +2 str +2 dex when applied to a weapon. If your weapon, say, is level 10 and has +3 STR--guess what? What. Well, you have a +5 STR weapon now, which you can use to Stairmaster your stats (#4).
6. GPS Pyramids
When you dismiss a companion, give them a pyramid. Then recall to them--it's a quick way in and out of the Hall of Heroes.
7. That Crafty Sales Guy
Keep one character that ONLY has +3 to crafting, blacksmithing, and bartering (and charisma). Keep him in the hall of heroes. Use that person to make everything, including selling/buying. Use the GPS pyramid technique to move back and forth quickly.
8. The Indian Giver
Ok, I feel a little guilty with this one. Just a little.
So, any item you ever sell--will be available for re-purchase from that vendor. The other way to re-purchase is to give the vendor a discount on life! That's right: kill the vendor, and they will drop everything you ever sold them. Then you can re-sell all those things. You can use this throughout the game. Here is the best technique: put a bunch of expensive things in a box. Find a vendor with tons of cash. Take the cash, exchange the box, kill the vendor. Take the box. Walk away like a boss.
9. They're all Witches!
Have all characters put 1 point into Witchcraft for Oath of destruction. 50% damage increase (yes, spells too).
10. Boxes are Just Ugly Backpacks.
To help organize, (this may be a no-brainer), use all kinds of containers, not just backpacks. Boxes, bags, baskets, even hay bales.
11. Resist the Man!
Add elemental essences to almost all your armor. Don't use them for anything else really. Fire resistance is most important. Rubies? Best loot ever, if you see one, buy it, steal it, sell your children for it.
12. Combo Mambo
Considering that spells interact to create explosions etc---let's say you have a weapon that inflicts burning on contact. Oh--and did you just make it deal poison too?! You just created a grenade sword. That's right. Werk it.
13. Respect The Respec
When you get to the point where you can respec: remember that it's sort of a one way street. 1 talent gives you 10 skill points, or 1 stat point. But you can't reverse this--once you've drained your talents, you can't get them back. That being said, keep about 2-3. Put the rest into skill points.
14. The love affair: Constitution + Speed.
These are the most important stats. Constitution gives you your maximum action points. Speed gives you how many you can recover per turn. Well, if your max is 10 and you can recover 18--that's what we call 'not so smart' in my neck of the woods. Equally, if your max action points is 20, but you're only recovering 5. Well, again, no so smart. Keep these two stats nearly equal. Yes, these stats are more important than any other stats. If you play it smart, you're looking at well above 20 action points per turn. And that's when you start asking bosses 'whas'mah name fool!'
15. Glass Canon Epidemic!
Everyone needs glass cannon. Add speed--and this makes you like Macho Man Randy Savage from way back in the day--all crazy frizzy hair and wild eyed. That's how I am now, as I write this.
16. Republican Tanks
That's right, let's do it the traditional way. Sword and shield. (or any 1h and shield)--is better than 2h. 2h will do maybe 30% more damage--but loses so much potential defense, that it's not worth it. You can have a shield with 50%+ resistances for *everything* (plus additional stats). In total, while a 2h tank does alright--it's just not as good as the 1h tank.
17. Featherfall In Love!
Alright, this one is kinda fun. If you take all the vendors in an area, and feather fall them all near the same portal--they stay there! That's right. Featherfall the ENTIRE town of useful people into one spot. An additional bonus, is you can steal their stuff while they're wondering why they're all standing around the portal.
UPDATE!
18. Magical Keys to Success!
I can't believe I almost forgot to put this one! It's fantastic!
Magical unlock scrolls--a rare find right? Not true boogaloo.
Here's the skinny: You can make them.
You might have already known that--but there's more. When you make a blank witchcraft scroll, put a magical pen to it--you'll get your spell. So let's say you have a stack of 10. You'll get approximately 3% to become Magical Unlock. Not that good right?
Make SURE the crafter has 0 points into witchcraft, this will increase the results to up 20% magical unlock scrolls. Of a stack of 20 blank scrolls, I was regularly getting 5-6 magical unlock scrolls.
And why? Because you get a much greater pool of 'random' spells that result from having more skill in Witchcraft (up to 12) and with no skill, you get around 4 types.
Venture forth!
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And that's all I've got for you now. I'll update as I think of them
Enjoy!