Immortalized
said
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Tenebri
said
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its been clearly discussed by jagex long before osrs was even a thing.
where?
it was in the "seven tiers of godhood" back in march 2013 so for them to be able to release that then it would of had to of been discussed and accepted long before the release of this. to accept its actually canon to the lore.
https://runescape.wiki/w/TzKal-Zuk#References
the physical link to the post doesnt anymore but maybe there is a back up somewhere i cba to look though. either way zuk was talked about in 2013.
so yes zuk has been a god for a long time in rs3, hes just been released to the physical game now though. osrs and rs3 share a lot of the same lore.
so no rs3 devs did not steal it from osrs
its just been in waiting to be released.
either way jagex ideas are jagex ideas, not really stolen