"Immortus Septun." said Lucas Silver, as he leapt into the water making it to where he could still talk under the water and thus would not be cut off from the abilities that the eternal saber pin would grant him as long as he had it at his disposal, because the eternal saber pin was a very powerful magical item. He then chanted another spell, one that would do something else and give Jonathan his full amount of strength, for if there was a fight Jonathan would need it.
In ancient Narrikian
"Zi qi auron dorock dimentia avalos ksud." A white aura formed around Jonathan unlocking some of the strength that Lucas had limited from him, effectively making him more powerful for the time being, and then the aura faded the effects of it being done and so this would do the job that it was meant to do.
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After the upgrade, a leap into the water by Jonathan happened so that he could assist Lucas and the others in whatever would lay ahead, but he made sure to keep one of his tachi handy, and before leaping cast the same spell Lucas had, that would allow him to talk under water. He also cast one however that would make his weapons not rust, dull or sink in the water essentially making them as light as a feather.
The assignment would be an easy one to accomplish. All he had to do was follow, grab the item and let Lucas wipe it out of existence with the eternal saber pin perhaps if the pin could do that. If not he would use his blade to destroy whatever the item was so that it would no longer be a problem.