Topic: Adding buffs and effect cards to the interface.
Everything is very simple
For example, a card
SLAUGHTER - For every 2 tnemies killed in milee, your weapon does 10% more damage up to a maximum of 20%.
SPIRAL OF VIOLENCE - your weapons cause 15% more damage for 20 secconds after using a finisher on an enemy
And special sign for wep +10%*picture bullets* and for melee +10%*picture fist*
This is just an example. Need any system. Sometimes it is not clear how the card works.