During my time here in the end game, I have noticed the ever diluted pool of vault troops growing. I believe I have come up with a solution that benefits us all without compromising the vault drop table with a tweak to how things are done.
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Remove ALL troops from the vault and replace them with a new key specifically for vault troops. This would appear at the same rate as the troops normally would.
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Add a new chest for the aforementioned vault troops. The troops would have the same drop rate as normal just in this isolated format.
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When a new troop is added allow a weekend where the drop rate is significantly increased.
This would allow us to use our vault keys but not get loads of duplicated troops when there is none we need, while still allowing newer players access to the troops from the vault.