I hope that twostars answered the questions of both of you.
Information about the red/black chitins:
There are Cavalry mobs, placed behind of the (outside) towers, in colony zone and they drop both red and block chitins.
Red chitins focus on AP bonus. e.g. rogue red chitin at +1, may give +2 dex bonus and +1 hp bonus. at +8 it may give +15 dex bonus and +8 hp bonus.
Black chitins focus on HP bonus e.g. rogue black chitin at +1, may give +1 dex bonus and +2 hp bonus. at +8 it may give +8 dex bonus and +15 hp bonus.