Mods

Mods are items that can "Modify" the attributes of weapons to a surprising degree. Weapon Accuracy and Damage output are obvious, but character HP/MP regeneration and Lucky as well with certain mods. Not all weapons can be modded as a Mod Slot is needed. Mods come in five different variants:
 * Ammo Clips
 * Battery Packs
 * Fuel Tanks
 * Relics
 * Rockets
 * Tech Mods

Obviously a Templar Sword won't need Rocket mods but it can often sport a Relic mod slot. Similarly a Hunter's Rocket Launcher rarely use Ammo mods but may sometimes have a Fuel Tank mod slot.

Ammo Clips

 * Health Regeneration
 * Power Regeneration

Battery Packs

 * Health Regeneration
 * Power Regeneration

Fuel Tanks
Fuel Tanks offer bonuses to streaming weapons primarily.
 * Health Regeneration
 * Power Regeneration

Relics

 * Health Regeneration
 * Power Regeneration

Rockets

 * Health Regeneration
 * Power Regeneration

Tech
Tech Mods don't offer >>unverified< >unverified<<, but they do offer bonuses to how a weapon is used. Weapon Accuracy, Firing Accuracy, Range, Critical Rate, Critical Damage Bonus, and...
 * Health Regeneration
 * Power Regeneration