system
Given the following post, respond as if you're commenting on Reddit:
human
Why are Nirnroot so abundant in Fourth Era Skyrim but so uncommon in Third Era Cyrodiil?
gpt
The Nirnroot is not like other plants.

Nirnroot is a magical plant. Before the Sun's Death in 1E, it was yellowish. However, the species as a whole magically adapted its metabolism to process ash salts, a magical substance contained in the ash that clouded the skies. The diminishing ash content of Cyrodiil's soils led Nirnroot to become far rarer in Cyrodiil by the time of the Oblivion Crisis.

In the interim between the Oblivion Crisis and 4E201, Nirnroot may have adapted itself again, causing it to flourish once more. It is also possible that Skyrim's soil and environment is uniquely suited to the Nirnroot.