I play the Elder Scrolls series a lot and they call their mana reserve Magicka. I liked the way it looked so I started spelling magick like that.
I just assumed you were English, common spelling for them across the pond.
Holy Cow. You guys are awesome. Thanks to everyone for all of your replies and I should have given you guys more information.
The party consists of my 8th level Lupin ranger, an 8th level half-elf cleric, a level 7 dwarf fighter, a level 6 half-orc fighter, a 6th level dwarf fighter, a 6th level feral half-dragon fighter, a 6th level high elf fighter, and a 6th level human fighter.
We are playing 3.5 but we were playing with 2e rules for about a year. When we switched the DM converted the Revenants with his own homebrew format. They do have Regeneration and not Fast Healing, because in 2e they had Regeneration and the DM said he doesn't care that Undead aren't allowed to have Regeneration in 3.5. The problem isn't reducing them to 0 hitpoints, it is turning off their regeneration.
He introduced them in our 2e campaign because they were immune to turning and there was an undead encounter where our cleric destroyed a bunch of skeletons. He didn't like that so he found undead that the cleric couldn't destroy.
We tried acid and fire but they didn't work so we just hacked at them until we felt a sufficient amount of damage and hightailed it.
You have SIX 3.5 Fighters in the same party? You cant drink just six.
http://www.enworld.org/forum/d-d-legacy-discussion/296012-why-3-5-fighter.html
But still, it seems you have a lot of melee power, they may have DR in addition to the regeneration. In anycase, nothing has Regeneration 5/-, there must be some solution. OR if somehow these are Unholy Apocalypse Undead, then there must be something your characters are supposed to do to stop them.
Also-NO RELATION.
Dungeons & Dragons Roleplaying Game Official Home Page - Article (Revenant)
Sorry I should have been more clear. He doesn't dislike magick, he dislikes magick users. And I have so much money because he doesn't allow us to buy magickal items, he wants us to find them. Luckily I don't believe he can prevent the cleric from using Craft Wondrous Items. Well he is the DM but that would be very cruel given our current situation.
Ah, a mage hater. I played under someone like that. I survived the "Bee Cave" Adventure. Try rescuing a dimwitted servant and his master from a cave littered with festering corpses in syrupy malebolges and lined with honeycombe growing through bones of long picked clean skeletons, the whole place choked by the sickenly sweet and sour stench of nectar and death. And these arent ordinary bees, they are fiendish and attracted to magic, swarming any source of magical power or the caster of a spell.
Its worse when your contractors fail to mention this at all, and you unexpectedly come to the cave and happen upon a dead wizard, body bloated and red, flesh covered in welts -his form contorted as though he was grasping and rending his robes before he died.
Then make it all for nothing, because even after killing the queen in the final chamber, you find that the party to be rescued has all perished. Nothing to do but pry whats still usable from the corpses, setting the whole place alight before you pray to all space that not a one survived to begin a new vile hive.
And he didnt just do that because he wanted to challenge the magic users of the party, he many, many, many times commented on how he hated all casting classes.
We beat it anyway though.

Although I almost died.
That's almost as bad as the time I got most of the flesh blasted off my bones by a CR 13 Steel Predator at 5th level. Although I survived that too. Be surprised what you can live through.
As for the magical items, I've done it both ways -make it yourself/loot it (god I hate random loot) OR live in a big city/Urban hub where there are bazaars and markets run by wizards and artificers.