Your item.svo file is in the game's install directory. In the Steam verison, it's typically in Program Files (x64)/Steam/steamapps/common/ToV/Data64.
The file that you import here is not modified in any way. To edit items you need to press Apply to every item that you make changes to and then use the Download button below the form. The new item.svo should be downloaded to your Downloads directory and it is your responsibility to backup the original item.svo in the game's install directory before placing the newly downloaded file there.
I would suggest unequipping items before modifying them. It is untested how the game will react if suddenly a skill on a weapon changes that a character hasn't completely learned yet, etc. Some changes (like attack affinity and elemental res) require re-equipping the item before the effects are fully applied.
Item and skill names were parsed from https://hyouta.com/vesperia/. It is an amazing resource without which most of this editor would not be possible.
Thanks to eligrey for the wonderful filesaver.js library.
Import your ToV item.svo file:
Weapons: Subweapons: Helmets: Armors: Trinkets:
Search for an item by:
Title:
Category:
PATK:
PDEF:
AGL:
MATK:
MDEF:
GALD:
EDMG:
Elemental damage taken:
Fire:
Earth:
Wind:
Ice:
Light:
Dark:
Negative values are resistances and positive values are weaknesses. -200 nullifies an element's damage, while +100 increases it by 50%. According to item descriptions, anyway.