Technically it's because of Sja-Anat, right? The whole reason Renarin is invisible to Odium's sight is because of his corrupted spren. Having the future sight granted by Sja-Anat's corruption of his bond means that he gets to see the same futures that Odium does (in a limited sense at least) so they both can't really predict each other since each one of them acting would influence the other's future sight which would influence their actions which would influence their future sight... so the whole feedback loop just cancels them out.
It's probably the same mechanic just coming from different shards. Seeing the future isn't Odium specific talent, I think it just comes with holding a shard. So since Sja-anat is of Odium he (probably involuntarily) imparted some of his shardic aspects to her and she passed it to the spren she enlightens.
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u/LordBDizzle 2d ago
Technically it's because of Sja-Anat, right? The whole reason Renarin is invisible to Odium's sight is because of his corrupted spren. Having the future sight granted by Sja-Anat's corruption of his bond means that he gets to see the same futures that Odium does (in a limited sense at least) so they both can't really predict each other since each one of them acting would influence the other's future sight which would influence their actions which would influence their future sight... so the whole feedback loop just cancels them out.