So, some time ago people found out about the Crea weapon series; rare melee weapons with low ATP that could drop from boxes and were not usable by CASTs or Beasts, but had the special ability of being able to hit one extra target. At the time, Itsuki speculated these weapons were usable only by Humans and Newmans because the melee-oriented stats of CASTs and Beasts could make these weapons 'broken'.
Currently, I believe the reason is actually different. Ofcourse, obvious counter-arguments would be that these more physically oriented races should have an advantage over the other races, or that they can also use other 'overpowered' weapons.
However, what CASTs and Beasts also have in common is that they are the only races that can have a 'damage gauge', used for their SUV weapons and Nanoblasts respectively. At least offline, these bar hit 100% either for every 50 hits dealt/taken (Beasts), or every 67 (CASTs). So, surely, spamming Skills using Crea weapons would yield these required amounts of hits quite quickly, which to me appears a more plausible explanation as to why these weapon series were restricted to Humans and Newmans.
Therefore, I'd like to argue that CASTs' and Beasts' special abilities are actually their primary weakness. Discuss. http://www.pso-world.com/images/phpb...icon_wacko.gif
