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I came across an interesting section on the official wiki, titled Historical Content. It contains a list of removed skills, quests, NPCs, items etc. from the game. I must say that some of the skills are quite interesting! I can only imagine the ways in which they would be used if they were included.
One particular example is:
|Disappear||Spell. You disappear for 10 seconds.|
Assassins would have a ball game with this!