Question Regarding Weapon Mods from Eternal 'Noob'. :P

This is my fourth character through the game, if you'd believe it - but here's my question. I'm utilizing the following weapon:

Cruel Giant Slayer's Hammer - 19-35 Damage
Damage + 13% while health is below 50%
Lengthen's Deep Wound Duration on Foe

Now, I'd like to mod the hammer with my own various implements. With this particular weapon, am I at risk of losing any of the internal mods? My speculation is that the 'Cruel' would be replaced if I were to mod it with a prefix item, but I would maintain the +13% damage no matter what. Am I correct?
Thanks for the help!

- Best Regards,
TheMarvin

You would keep the 13% damage no matter what. (unless you sold it).

Thanks a bunch - That's what I thought. Now I need to figure out what the appropriate prefix for Hammer Users is - I finally caved in and created a Warrior char as my fourth character through the game, and i'm sort of clueless about weaponry.