For the final boss you must have AT LEAST 1 level 6-7 purple to reduce his armor(you can get by with only 1 if you strategically move it around as he is going through the maze. You must also have enough mana to let him pass once.
Hidden World of GemCraftDude! You just completed the Hidden World of GemCraft achievement in GemCraft and won the Hidden World of GemCraft badge and 30 points!
How about a All levels glowing badge?