"What... What should this even mean?", asked quietly Joe as he looked at information on Emma's device.
'Heritage: Immortal'
The moment Joe saw the word 'Immortal' he didn't know how to react. Like Greg's Heritage name, the Thousand Vision indicated that Greg's Heritage was associated with his vision.
This was also true about his Heritage. Like his Heritage 'Thunder Bird' showed, his power was associated with thunder. However, he still didn't find out how he could use it or what kind of requirements he needed to activate it.
As for Emma's Heritage, the word 'Immortal' was way too complex. It could mean she couldn't die, it could mean she would be able to obtain unlimited power for a restricted amount of time or even something else.
However, the biggest problem here was the name. While others could find out sooner or later what the requirements could be, because of the Heritage name, this single word didn't tell any clue to him at all.