I just killed both the spirit warrior and spirit wizard, but I was too late or too slow in getting the ruined figurines (the stairs leading to them dropped). Is there any way to get those stairs back up or do I have to start the fight all over again??

Use your pretty orange crystals. Warrior goes in the chamber to left, wizard one to right. You can get them ID if you don't know which is which. You only get to chose ONE so save because that locks you into a certain path later. Your game should have a "online" read me file that appears as one of choices when you load your game from Windows. It is for crypt - complete with maps and hints. Saved me from starting over! Luck!

That's what I did, too.. I killed the dirty dogs but didn't notice that they dropped anything. I ended up doing an uninstall, remove save directory, reinstall, start over.

Hopefully someone else has another solution to your quandary.. perhaps a revert game?

you still need the figurines after getting the crystals. Carry boxes/barrels down to those rooms and jump up on them to get up to the figurines.