[quote=@l0ck0n]
<Snipped quote by Ammokkx>

Ohh, alright. I got it. Should have known that Cruxi can't be killed by mere bullets. 
[/quote]

No, the regular Cruxi can. Just a special weapon they've deployed, Mist, is immune to Kinetic type ammunition. Only energy and other similar forms of attacking seems to be able to harm it. Gimme a sec, I'll edit in Ariamis' description of Mist.

EDIT: 

"Mist is reported to be capable of attacking in a 360-degree radius in both vertical and horizontal axis, emitting some kind of radiation-based wave that bypasses Framewerk armor and liquefies the pilot inside when placed under any kind of threat or danger. However, thanks to Squad Beta's honorable sacrifice, we have found out two weaknesses to this weapon; it doesn't differentiate between ally and enemy, and that it's limited to a maximum of medium-range in Framewerk weapon ranges."

"When Mist was targeted by squad Beta, it seemed to immediately respond with the weapon's activation, incurring three immediate Framewerk casualties from pilots who were caught in range. The wave is mostly invisible to the naked eye, so you must keep your distance to it at all costs." 

"Reports from Beta confirm that the unit is immune to kinetic ammunition. No machine is without a weakness, however, so I trust in your ability to take it down. That is what you have trained for, after all."

"An electrical weapon was used against it by squad Beta, and it seemed incur a positive result, so we can assume that it is susceptible to energy weapons. As for the pilot, we have no confirmations. There is a possibility that it is an UACV, but regardless of how it is operated the elimination of the weapon is a primary objective."