What about the "see invisible units" ability?? And more, achievements mid-way, i mean, you earn allmost all achiements and still play a lot of the game just to earn 1 or 2, it gets boring. Should be things like "kill 10.000 units" , "spend 100.000$", mid-way medium/hard achievements. But this game rules !!!
Too easy to kill the diablo.... sen just the sucubus and the archers... and let them do theyr job... they'll get out of the lords range... so he wont attack them... and theyll attack him :D