Natural Innovation
Simply removes the minimum year requirements for medieval eras, which are 900 AD, 1050 AD and 1200 AD for Early, High and Late Medieval eras respectively.
To partially compensate, each era now requires 65% (instead of 50%) of its innovations to be known before unlocking the next era.
Tribal cultures still cannot progress past the Tribal era. This requirement is unchanged.
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Revisions:
Old revisions of this mod are available below. Click the link to download.
