Aggressive - These guys attack sometimes so be careful around them.
It's a mood
It's this part of the xenobe code that determines their actions:
Explorer - Moves and looks for a target in the sector he moves to.
Trader - Moves, trades if possible then looks for a target in that sector.
Hunter - Very rare due to the fact that they tend to kill themselves, they target a player then act depending on their Mood or they will attack a planet defeating the defenses and leave the planet unnowned ready for the next Xenobe that wants a planet or the next player who is lucky enough to find it.
Megalith...check your forums msg bug may have resurfaced...sent you 3 on additional bugs found