Enhance Vegypygmie Chieftain AI

[granny]

More than  once the Vegypygmie Chieftain has killed himself with his own evards.

... I would not complain but it is too funny to see that happen so many times. Maybe if the AI isn't the issue, the Chieftain could have a boost in his DR or be immune to evards? I dunno.

[Howlando]

Fixed.