Lorebook stuff! And a weigh-in by Sounsyy! That helps. 
So I was right in remembering that there were different "aspects" of the Echo one could have, either in part or in whole. And that the Sahagain technically had it too, though it being "gifted" by the Ascians is something that slipped my mind.
Going with the three in the Lorebook, Krile can Transcend Words, Minfilia can Transcend Worlds (though I wonder if she had anything else before that and this bit was mostly due to the Mothercrystal claiming her as a voice), and the WoL can do all three because WoL. So... which one of those did the Sahagin Priest have? Unless Trascending Worlds included the realms of the living and the dead and basically having that Ascian-immortality going. Or there's other aspects of it that are being withheld and thus weren't mentioned in the lorebook.
However, I wonder if having the Echo and being a being of hero of history/"chosen" and all that is a square and rectangle situation. You know, "all squares are rectangles, but not all rectangles are squares." To wit, these heroes of time had the Echo, but having the Echo doesn't leave you fated to do great things. Though the whole being "touched by Hydaelyn" part makes it seem unlikely, though that could also be a bit of an exaggeration and many could be "touched" in such a manner who don't really answer the call. Unless the Ascians were also "touched," either by Hydaelyn herself or their counterpart (Zodiark?). Hm.
Well, if it does end up being a "for special people only" thing... at least there's been IC workarounds to tempering. I know a couple FCs that have gone after primals using a special device that helps block that sort of thing. Though, one has to wonder how important that is, unless the original poster's history requires the character to have survived a tempering rather than avoiding it through other means.
Bypassing language is a different issue... but sometimes linguistics itself can be fun. I mean, I have an alt I haven't really used who is basically a linguistics specialist and can speak several other languages because that's his skill set rather than having the Echo.
EDIT: A bunch of minor edits based off posts that happened while I was writing this! And some minor spelling fixes noticed after-the-fact. ... I still think it should be fine to play as having at least a minor Echo aspect regardless, though!
So I was right in remembering that there were different "aspects" of the Echo one could have, either in part or in whole. And that the Sahagain technically had it too, though it being "gifted" by the Ascians is something that slipped my mind.
Going with the three in the Lorebook, Krile can Transcend Words, Minfilia can Transcend Worlds (though I wonder if she had anything else before that and this bit was mostly due to the Mothercrystal claiming her as a voice), and the WoL can do all three because WoL. So... which one of those did the Sahagin Priest have? Unless Trascending Worlds included the realms of the living and the dead and basically having that Ascian-immortality going. Or there's other aspects of it that are being withheld and thus weren't mentioned in the lorebook.
However, I wonder if having the Echo and being a being of hero of history/"chosen" and all that is a square and rectangle situation. You know, "all squares are rectangles, but not all rectangles are squares." To wit, these heroes of time had the Echo, but having the Echo doesn't leave you fated to do great things. Though the whole being "touched by Hydaelyn" part makes it seem unlikely, though that could also be a bit of an exaggeration and many could be "touched" in such a manner who don't really answer the call. Unless the Ascians were also "touched," either by Hydaelyn herself or their counterpart (Zodiark?). Hm.
Well, if it does end up being a "for special people only" thing... at least there's been IC workarounds to tempering. I know a couple FCs that have gone after primals using a special device that helps block that sort of thing. Though, one has to wonder how important that is, unless the original poster's history requires the character to have survived a tempering rather than avoiding it through other means.
Bypassing language is a different issue... but sometimes linguistics itself can be fun. I mean, I have an alt I haven't really used who is basically a linguistics specialist and can speak several other languages because that's his skill set rather than having the Echo.
EDIT: A bunch of minor edits based off posts that happened while I was writing this! And some minor spelling fixes noticed after-the-fact. ... I still think it should be fine to play as having at least a minor Echo aspect regardless, though!
~