Cover

In a frenetic battle, you will pray for any kind of protection. Covers like walls, buildings or even people can protect you from incoming fire or even explosions. Alternatively, when in quiet, cover can act as a barrier helping you to stay hidden before the first strike.

Cover Disadvantage

A creature gains a penalty when trying to attack another creature that is behind cover. When a creature is making the Attack, they gain a number of Disadvantage equal to Cover Size - Creature Size.

Cover Advantage

When standing next to an object tor creature that is larger than you, other creatures gain penalties whentrying to spot you from the other side of the cover. Whenever a creature is trying to spot you from the other size of a cover, they gain Disadvantage equal to the Cover Size - Creature Size.

This is also the case when trying resist damage coming from the other size of the cover. Whenever you are making a check to resist damage coming from the other size of the cover, you gain Advantage equal to the Cover Size - Creature Size.