Hey all It took about 5 hours but I made this: http://img696.imageshack.us/img696/811/grade18.png I also had a grade 17 and 16 so was almost to a grade 19 but lag was far too much of an issue, even with all the settings put to 0. Eventually, I just took the R/O gems out of the traps and decided to suicide it because I didn't have time. Im proud of it.
The only reason why you would make grade 18 gems is to use them for a boss wave. The max grade you should use is grade 15 prismatic, and add grade 9s to this to get the damage super high. Also, place the gem in a trap, not in a tower - it actually deals more damage because of the 6x hit and increased firing speed, plus it's got WAY better specials.
The only reason why you would make grade 18 gems is to use them for a boss wave. The max grade you should use is grade 15 prismatic, and add grade 9s to this to get the damage super high. Also, place the gem in a trap, not in a tower - it actually deals more damage because of the 6x hit and increased firing speed, plus it's got WAY better specials