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OK, terrible jokes aside, the use action is an entirely new action category in Corefinder, one devoted specifically to manipulating or otherwise interacting with physical objects. There are a handful of exceptions that deal with interacting with another creature in a very specific way, essentially actions that treat that other creature and your interaction with it in a very similar way to how you would interact with or manipulate an object.
We’ll deal with the exceptions tomorrow, but for today let’s run down the list of use objects for dealing with objects. Some of these were vaguely defined or undefined in Pathfinder, or were “not exactly their own action but maybe part of another action.” In Corefinder we’re trying to refine and streamline actions so everything has a place of its own.
Remember also that the use action is a new type of action and you get one per round. In most cases, if an action was part of some kind of kludgy combo action in Pathfinder, you can still do it in Corefinder in the same way, since you can take your use action in the middle of moving or attacking or doing other actions if you want, but now the separate parts of the action are discrete and exist on their own instead of being buried in 20 different places as special corner cases.
Change Grip: You change how many hands you are using to wield a weapon, moving from a one-handed to two-handed grip or vice versa. If the weapon requires two hands to wield, you can hold and carry it in one hand but are not considered to be wielding it and do not threaten with it when doing so.
You also can use this action to adjust your grip on your weapon when your enemy uses a disarm or sunder maneuver, eliminating the attack roll penalty.
Draw a Weapon: You retrieve a weapon from its sheath, belt loop, quiver, or similar storage.
Drop a Shield: You unstrap a shield and drop it to the ground.
Extend Search: If you are using a Search action, you can spend a Use action to expand the radius of that Search by 5 feet.
Load Ammunition (light): You draw a piece of ammunition and load it into a light projectile weapon, such as a bow, firearm, sling, or light or hand crossbow.
Move an Object: You can move an object whose weight is equal to your light load from any square adjacent to you to any other square adjacent to you. This does not require a check.
Open or Close a Door: You can open or close a door, window, gate, or similar opening. If it is locked and you have a key or access to the latch mechanism, unlocking it or locking it requires a separate use action.
Pass an Item: You give an item that is in your hand to an ally within your reach. As long as they have a free hand, they can receive the item and are then holding it at the end of your turn.
Pick up an Item: You pick up an item from the ground or another surface. You must have a free hand.
Put on a Shield: You strap on a shield.
Raise a Shield: You move your shield into a ready position, allowing you to actively defend with it. Until the beginning of your next turn, your shield provides a circumstance bonus to AC equal to its normal gear bonus to AC; the circumstance bonus replaces the gear bonus.
Ready an Off-hand Weapon: You move a weapon in your off-hand into position to use the attack with Dual Attack action.
Search: You carefully examine all squares within 10 feet of you, making a Perception check to notice any hidden or undetected objects or creatures in that area.
Sheathe a Weapon: You stow a weapon back in its sheath or other holder. For a large weapon like a spear or polearm, this essentially means grounding the tip of the weapon, slinging it over your shoulder, or otherwise changing your grip so you are not holding it ready for combat.
Stand Up from a Chair: If you are sitting on a chair, bench, table, or other elevated platform, you can stand up as a use action rather than a move action.
Use a Simple Item: This general action includes any kind of general action involving manipulating or interacting with a small object or device not otherwise covered above, such as opening curtains, turning a switch on or off, put on or take off a cloak or gloves, and the like.
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