After the first hour of tempering, the following fire affinity improvement came two hours later, then four hours, and so on.
Ding!
…
…
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[Dragon Force (Low-rank) (Upgradeable)]
Effect: Passively increase your base strength by 16% (↑2%) and base defense by 8% (↑1%).
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Ding!
…
It only took Vaan roughly thirty hours to reach the maximum benefits permissible by the third stage's lava pool.
The rate of improvement was vastly superior to the first and second stages.
It was no wonder that the higher-ranking dragons aimed for the latter stages and challenged their limits.