Sharkmatto, Luca_canada, Dragon and I killed one momentus (They were fighting him for two days, took me an hour). Where we are, there are 4 (now 3) of them >:O
Aikar, after 1.6.2 code is done could we please get a health bar for Momentus and Marlix, similar to that for the Ender Dragon? It would really help to see progress and know when they are close to death. I hope this is doable. Thank you.
It seems like there are certain areas on servers where the boss's spawn more frequently, seeing as we've had 3 Marlix's and 4 Momentus's in the past 2 days...
On smp 1, all of the momentuses i've seen or heard of were in a desert. You could try looking in deserts.