Low morale on weapon
 

Race undead:

When I just bought lvl 4 weapon, it's Morale: Normal but after I use it for a while, it says Morale: Low.

Why other races (Human, Elves) does not have moral but Undead has? And how do I improve the weapon morale? Please help, thanks.

Soon you dont can use it longer... you can supress it later...press right mouse button on it and see?

Maybe I have wrong... but can the morale raise without supress on fights???

Items with personality have the morale stat, which can go up and down depending on several factors.
A large number of these items lower their morale after each fight.
Whenever the morale reach 0 you cannot use the item anymore, but need to "suppress" its guardians -> right click on weapon and click suppress.
You'll have to fight the item guardians the same way as you do when you upgrade the item. If you win, weapon morale is set back to 100.

p.s. Item race has no effect on morale, other races' items can have morale too.