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Found a new trick with the Metatranscender. The battlefield layout with the Azure Dragons guarding the Library of Light and the Wisdom artifact allows you to position a single-hex unit in a cell where the Azure Dragons cannot attack it. This way, with the Blade of Armageddon, you can free the Library of Light and give the Wisdom artifact to Dessa as early as week 2. I need to consider whether this is worth the significant slowdown and sacrificing a couple of Titans – if you rush there as well, Dessa won't be able to complete many of the tasks planned for week 2.
Update:
Of course, it's worth it.
P.S. I don't believe in such coincidences; BioBob definitely made sure that it makes sense to keep Dessa and the Blade for the speedrun.
Added after 24 minutes:
Yes, and with the Redemption of Fata, you can kill the quest Enchanters of the Blue faction without losing the Blade, as they have combat magic.
Added after 2 hours 37 minutes:
Yes, it works well – the Library of Light is freed on day 125, and Dessa learns Wisdom on day 126.
Added after 51 seconds:
And the pace is practically maintained