I really enjoyed this game, letting it run in the background then checking on gear found. Clicking madly for a few minutes and grabbing achievements. Until I realised one achievement is never going to be obtained. I put the chest item on my Undead that gives me an additional undead unit every 700 kills it makes. That's really cool, except i was at 60 when it went on, now I'm at 134 and no achievement for 100 undead units. The cost of an additional unit is now at 7.1 billion and climbs each time I get another unit.