In the challenge levels, it's good to have paralysis and lightning, their deadly combos. Also Morphing Strike is a really good pod too. Most of the good skills are from the Preserver and Enhancer trees.
somthing awesome can happen, i got the cannon thng, accidentally shoot it 90 degrees but when he comes down when hes walking that friction heat follows him backwards :)
omg.. octopus is easy to kill :), u need full speed/agility and tons of good spells(lightning,quake,swamp,twister) u need max reload, first kill other civilizations with ur spells(takes less than a minute) then break to arms(preferably the bottom 2) then go for the head using ur bottom buildings. it dies if u go for the head. the head isnt hard if u constant spawn at him
nice game easy too, if ur having trouble with the optical boss then try this: get past the boss and DO NOT hit it, open the green gates and get anihalation. spam ur shots behind the laser eye shooting guy, the optical boss dies quickly and boom :D
claymore is not the best the best wud be godlike weapons(if u cxan enchant even better)and u have to go thru adventure places, each adventure has their own rest area