Few days ago when i was camping Fafnir/Nidhogg, our LS leader said "Okay guys, we will try something different today, a MNK will tank the dragon."
And we were like "MNK Tank?!?! WTF?!?" and he just said, "let's try and see."
The mnk had Arhat+1 gears, Darksteel+1, Terra Staff, and other +HP equip, (no Black Belt or Defending Ring yet).
So, Nidhogg pop, we got claim; and the MNK tank side by side with PLD, voke and get hate with Chi Blast, he's a galka MNK with about 1800 HP. Nidhogg hit PLD for 200-250, but it hit MNK for only 180-230!
First time for everything, never thought about MNK tanking HNM but imagine if he have defending ring and black belt O_o