If you make tier 4, maybe you could add some FSC-like levels. For an example Waterwave Citedal, maybe copy the depth 25 and some other and just replace the orange(fire) color with the aqua color. Maybe it could be like blue gas or something, even the actual water might work as these things on the floor. The boss could be named "Watercrash" or something like that. The cost to enter the gate might be 700-1000 crowns. The water that extinguishes the fire in FSC could be Ice perhaps? For WWC (already given it a nickname,lol), I think you should earn more then in FSC, about 4000 each depth? It shouldn't be very hard to go through it, easier then shadow lair but harder then FSC. There could be depths 30-39 + the final station at depth 40 named "A Mystical Land", terminal (where you can buy 10 5* recipes,10 4* recipes) should be at depth 33 or 34, you decide.

I think at "A Mystical Place" should be waterfalls all around the place, and in the middle a huge shallow lake and in the top left corner there should be a token buyer and only there you can buy the gear from this boss, I think there should be a sword, too. The costs of the armor and helm should be around 25 tokens (you get 1-4 at each boss run) and the sword should be 40 tokens. The sword might be elemental + piercing + normal and all the bars should be filled near the maximum at level 10. There could be an upgrade, for an example "The Shadow Mystical Sword", that could have 6 stars and the recipe can be bought from the token buyer at "A Mystical Place" for 50 tokens, or at least at the guy who sells needles and stuff like that by krogmo coins for 275 krogmo coins. The alchemy should cost 1600 energy and there should be these materials :
-100 dark shards
-10 light shards
-30 red shards
-3 trojan horseshoes
-2 sun silvers
-3 volcanic irons
-1 water shard (you can make it be bought for 10 tokens at "A Mystical Place")

The rest of this you figure out !

I hope you all like this guys, if you have any comments/reviews post below !

-Booza