Deleted User - 1178646
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You are right I just looked in the wiki. Upgrading the vortex cost more KP than upgrading the Maze, which had been the most expensive one.
The only reason I am leveling the vortex is because it's the most points on the lowest footprint, the new wonders have a better ratio than golden abyss,
For me it's a bit easier to level it, each tournament is 700 KP, and when I start searching for KP in wonders it aint that hard to get more than 1000KP a week as well. a good internal fellowship wonder ROI and wonders level up really really fast.