Unit modification.

Okay. }{0TT@6bI4 most likely means that it cannot be changed without modifying the exe file.
This is true for some things, and this should be kept in mind. Specifically, the range of accurate shots by crossbowmen is changed by this mod: WGE
It seems that the regeneration rate can also be changed (and I thought it was common for hydras and wyverns, and generally for this ability).
My guess is to look in data.pak/GameMechanics/RPGStats/DefaultStats.xdb
The parameters PreciseShotRange and HydraRegenerationMax seem correct.

And yes, you should understand that almost any balance mods change DefaultStats, which will make your mod incompatible with them if you also modify this file.