FS 1 ~ 10 = 10x Blackstone Armor + 5 pieces of reblath (cost to repair max durability) 2.2 mill (Blackstones) + 64,500 (12,900 x 5) 2,264,500

FS 11 ~ 20 10x Blackstone Armror + 2 pieces of Agerian (rounding from durable option) 2.2 mill + 150K x 2 (MP has been 130 ~ 180K recently) = 300K

2,500,000

FS 21 - 25 = 5x Hard Shard 10x Blackstone Armor + 50 Durability (Assuming attempted PRI on green armor) 1.6 mill x 5 = 8 mill (Hards) + 2.2 mill (Blackstones) + 5 x Agerian = 750K 10,950,000

Grand total for perfect FS -> 25 = 15,714,500

Failure 1: Cost of success at FS 5 = (6th attempt, succeeded, refunded 1) 5 Blackstone Armor + 3 pieces of reblath 1.1 Mill + 38,700 1,138,700

Failure 2: Cost of success at 15 FS = 15 Blackstone Armor + 5 pieces of reblath + 1 piece of agerian 3.3 million + 64,500 + 150K 3,514,500

Failure 3: Cost of Failure at 23 FS = 23 Blackstone armor, 4 Hard Shards (only 1 armor stone to refund), 5 pieces of reblath, 6 pieces of agerian 6.4 mill (Hards), 5,060,000 (Blackstone), 64,500 (reblath), 900K (agerian) 12,424,500

Total cost of estimated failures: 17,077,700

Failstack value can be complicated to wrap your head around. The way I stack is usually 1 - 10 on attempting +15 on reblath, 10 - 20 attempting +15 on some green gear (agerian/hercules armor), then I go for PRI or DUO on something to about 25. Usually on boss gear, because I've had a lot of it for some reason.Here's how I look at FS value:Now, the part that makes this hard to calculate is the chance of accidentally succeeding. So that makes the above calculation is theof failstacking. If we assume generally that you fail in the middle of each of the three tiers attempting to build a 25, that would mean roughly half the cost of each step is added successively minus the cost of the refunded black stone for degrading your FS gear. Bear in mind, that this is aestimate, so your mileage may vary:Combine that with your perfect FS run, and you getAgain, this may be a conservative estimate. If you assume multiple failures at each stage, and figure the average will fall somewhere in the middle, just add that tier to the grand total.Hope this helps understand a bit of how pricing FS works!