A feat represents a talent or an area of expertise that gives a character special capabilities. It embodies training, experience, and abilities beyond what a class provides.
At certain levels, your class gives you the Ability Score Improvement feature. Using the optional feats rule, you can forgo taking that feature to take a feat of your choice instead. You can take each feat only once, unless the feat’s description says otherwise.
You must meet any prerequisite specified in a feat to take that feat. If you ever lose a feat’s prerequisite, you can’t use that feat until you regain the prerequisite. For example, the Grappler feat requires you to have a Strength of 13 or higher. If your Strength is reduced below 13 somehow—perhaps by a withering curse—you can’t benefit from the Grappler feat until your Strength is restored.
Prerequisite: Strength 13 or higher
You’ve developed the skills necessary to hold your own in close-quarters grappling. You gain the following benefits:
- You have advantage on attack rolls against a creature you are grappling.
- You can use your action to try to pin a creature grappled by you. To do so, make another grapple check. If you succeed, you and the creature are both restrained until the grapple ends.
There are more feats available but not from Wizards of the Coast (TM). See them here (consult your GM before using!)