Credit for finding: Tamlan
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Hi <@386020320152256512> ! I found this from the post by schaf on the old phoenix forums w.r.t. the new gemcrafting:
A legendary spellcrafter can upgrade the stats and resistances on ROG Accessories (jewel, necklace, cloak, belt, bracer, ring), upgrading a stat or resistance by 1 is done via the combining trade window using an increasing amount of Phoenix Ash, Phoenix Dust and the highest level spellcrafting gem for the relevant stat or resistance.
The stat or resistance must already be present on the item, you can only increase the value of an already existing bonus. The upgrade cost depends on the current bonus for the chosen stat or resistance.
The dust cost formula to increase an existing stat by 1 on level 51 rog accessories is: 5 * new stat + new stat * new stat * new stat * new stat / 100, truncated. The ash cost is always 3x the dust cost. All upgrade require the highest level spellcrafting gem (Perfect). To upgrade the acuity stat any acuity stat (int, cha, pie, emp) gem will work. To increase a resistance by 1 instead of a stat the dust and ash cost are tripled. Stat upgrade costs: Stat Phoenix Dust Phoenix Ash 1 → 2 10 30 2 → 3 15 45 3 → 4 22 66 4 → 5 31 93 5 → 6 42 126 6 → 7 59 177 7 → 8 80 240 8 → 9 110 330 9 → 10 150 450 10 → 11 201 603 11 → 12 267 801 12 → 13 350 1050 13 → 14 454 1362 14 → 15 581 1743 15 → 16 735 2205 16 → 17 920 2760 17 → 18 1139 3417 18 → 19 1398 4194 19 → 20 1700 5100 20 → 21 2049 6147 21 → 22 2452 7356 22 → 23 2913 8739 23 → 24 3437 10311 24 → 25 4031 12093 25 → 26 4699 14097 26 → 27 5449 16347 27 → 28 6286 18858