Henry skimmed through the Quest details and remembered he had 18 Stat Points to allocate.
'11 Stat Points to Stamina. 7 to Agility.'
[Are you sure?]
'Yes.'
[Stamina: 19 ———> 30]
[Agility: 56 ———> 63]
As his Stats ticked up and increased, Henry could see Echo mimic them but he didn't care.
Similar Stamina was another scam by the mummified Undead. Unlike Henry, it couldn't actually feel fatigue. The only practical use Echo could have for the Stamina Stat was for it to act as a cap to how much 'energy' it could draw on to facilitate whatever magical Might it mimicked from Henry.
On the other hand, Henry could get tired. He had gotten so tapped out recently and drinking a Healing Potion had done very little to help with that so he needed as much of a boost as he could get.
With his Stamina increase, Henry could already feel a boost in his internal energy and it had him fired up and rearing to go.