These are polarised slots if you put a mod of the same polarity the mod will drain half of the capacity it requires. – source warframe.wikiĪs you might realise sometimes, some slots have a sign for example “V”/”D”. As of now there are over 835 mods in the game. These cards can be equipped on sentinels, Kubrows, Weapons, Warframes, Power, Archwings, etc. These special kinds of cards can be equipped using the Arsenal located on the back side of the ship. Warframe Mods/Mods are used to enhance the abilities of the weapon/warframe.