this item has a description "+25Max Endurance  -25 Max Health"

 

but in the game 3.03 when you equip this item , character's HP NOT just reduce 25 points

 

for character  hp 294   =>  hp 119 (when equiped)  

 

for Calisca hp 253  => hp 103 (when equiped)

 

 

 

 

 

Yeah, it's the same as the Vital Essence bug: https://forums.obsidian.net/topic/87978-vital-essence-bug/ (though there it's a bonus).

 

Essentially, the -25 gets multiplied by the class Health multiplier (eg. 5 for Fighters) and the CON Health/Endurance bonus. So your character drops -175 = -25 x 5 x 1.4 (suggesting that he has a CON of 18).