the spell for the dark mark is mordsmore
Morsmordre, but close enough.
Pretty tricky: name the three brothers.
Antioch, Cadmus, and Ignotus Peverell, Each were the original owners of teh Deathly Hallows.
Anitoch owned the Elder Wand
Cadmus owned the Resurrection Ring
And Ignotus was the owner of the Invisibility cloak
i think i overdid the answer a bit :S
(harry and voldemort are descendents of the peverells
i think i read the books too much to remember the names and what hallow belonged to who)