The live preview show clearly the Travele using the shield underwater. You think it will be a skill or just a reaction shield? Will he be able to use it on land as well??
For now, i believe it's just part of the underwater exploration : maybe from a gadget or something you pick-up underwater.
Still, it could be interesting : traveller's kits often have similarities with the archon of the same element. And we're all wondering how they can make the hydro archon relevant, when we already have so many great hydro units. But there's no hydro shielder yet...
If Focalors turns out to be a shielder with added utility or damage, i know who will get the last slot in my Raiden/Kokomi hyperbloom.