Only a very few items in general have the option to be upgraded to the Mark 5 variant.
Existing system should not be changed, but only expanded for all of the items that can only be upgraded to Mark 4.
This includes:
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destroyer weapons
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destroyer modules
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ship weapons
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ship modules
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all equipment in general
Items will require the same crafting components. Keep all of the criteria the same for material upgrades, except:
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decrease the cost of monocrystals by 67%
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add one more resource - refined Iridium (equivalent coefficient for Iridium cost - T3-50, T4-100, T5-150 units)
Mark 5 should also become researchable - increased credit cost and loyalty vouchers as a free alternative, when fully researched.