They are off base items because the suck a giant donkey **** :)

http://www.mobafire.com/league-of-legends/build/duffs-336706
Come hang out when I'm streaming! http://www.twitch.tv/dufftime
Tiamat might be the worst item in the game. :P

http://www.mobafire.com/league-of-legends/build/duffs-336706
Come hang out when I'm streaming! http://www.twitch.tv/dufftime

One day those stars will align and when they do you will probably still wish you had a different item instead.
This is the stuff that YouTube is made for not dependable play. When you invest in an item you want to have a predictable outcome if your enemys are bunched up like bowling pins you'd probably win the game by any other natural means provided you have any aoe spell on your team.
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More seriously, it might have some potential with on-hit abilities like