In Game of War: Fire Age, Gem slot research allows you to add a fourth Gem slot to your equipment. The research is split into separate abilities for each item slot. You will also need to research core/relics and normal equipment separately.
The first gem slots unlocked are for Core and Relic equipment only. The resource cost is huge and comparable to some of the highest in the game (most slots need over 100 million of each resource).
To unlock additional gem slots for normal equipment requires most of the crafting tree to be maxed and the core/relic slots unlocked. You also need even more resources than the core gem slots, which can be seen in the tables below.
Whilst the additional slots may give you the edge in some battles, clearly the resource cost means this is probably only for the top players. There are far more useful research to aim for in other trees before you look to unlocking these slots.
The first table below shows the resource cost and rewards for each of the normal equipment 4th gem slots. The second table shows the resource cost for core and relic equipment.
|4th Gem Slot Normal Foot Armor||133,597,000||110,238,000||116,480,000||105,569,000||131,090,000||2999d 16h 30m||Academy 21,
4th Gem Slot Core/Relic Foot Armor,
Level 5 Refinement 10
|4th Gem Slot Normal Helm||171,768,000||141,735,000||149,760,000||135,732,000||168,545,000||3856d 17h 56m||Academy 21,
4th Gem Slot Core/Relic Helm,
Level 6 Refinement 10
|4th Gem Slot Normal Armor||51,914,430||60,191,860||78,997,230||82,070,260||93,708,380||3429d 11h 40m||Academy 21,
Core Crafting Luck II 10
|4th Gem Slot Normal Weapon||85,155,860||105,799,760||72,253,430||90,316,890||98,058,320||2037d 0h 22m||Academy 21,
4th Gem Slot Core/Relic Weapon
|4th Gem Slot Normal Accessory||136,249,360||169,279,600||115,605,480||144,507,020||156,893,310||3259d 5h 24m||Academy 21,
6th Piece Crafting Slot,
4th Gem Slot Core/Relic Accessory
|4th Gem Slot Accessory 2||121,110,540||167,851,252||102,760,430||128,450,680||141,747,935||2897d 2h 8m||Academy 21,
5th Piece Crafting Slot,
4th Gem Slot Core/Relic Accessory,
4th Gem Slot Normal Weapon,
|4th Gem Slot Accessory 3||181,665,810||225,706,130||154,140,640||192,676,020||209,191,080||4345d 15h 12m||Academy 21,
6th Piece Crafting Slot,
4th Gem Slot Accessory 2
|4th Gem Slot Relic/Core Foot Armor||114,512,000||94,490,000||99,840,000||90,488,000||112,363,000||2571d 4h 3m||Academy 21,
Level 3 Refinement 10
|4th Gem Slot Relic/Core Helm||143,140,000||118,112,000||124,800,000||113,110,000||140,454,000||3213d 23h 0m||Academy 21,
Level 4 Refinement 10
|4th Gem Slot Relic/Core Armor||34,609,620||40,127,910||52,664,820||54,713,500||62,472,250||2286d 7h 47m||Academy 21,
Core Crafting Luck 10
|4th Gem Slot Relic/Core Weapon||56,770,570||70,533,170||48,168,950||60,211,260||65,372,210||1358d 0h 15m||Academy 21,
Core Crafting Luck I & II 10,
Duration III 10
|4th Gem Slot Relic/Core Accessory||90,832,900||112,853,070||77,070,320||96,338,010||104,595,540||2172d 19h 36m||Academy 21,
4th Gem Slot Normal Armor,
5th Piece Crafting Slot
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