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Whirlwind Attack Feat Description
"The Whirlwind Attack feat (Core Rulebook, p.136) says:
Prerequisites: Dex 13, Int 13, Combat Expertise, Dodge, Mobility, Spring Attack, base attack bonus +4.
Benefit: When you use the full-attack action, you can give up your regular attacks and instead make one melee attack at your full base attack bonus against each opponent within reach."
The key phrase here is that you make one melee attack against each opponent within reach.
The feat does not say you are making a series of attacks or a full-attack action with different weapons, but rather that you make “one melee attack” at your full base attack bonus against all targets within reach.
This is typically understood as being with whatever weapon (or unarmed strike) you are currently using to perform your melee attack.
General Rules for Full-Attack Actions- In a normal full-attack action, a character can make multiple attacks, and they can switch weapons between attacks (as long as they have the necessary actions to do so).
However, Whirlwind Attack is a specific type of full-attack action, and it only allows one melee attack per target within reach, rather than a normal sequence of iterative attacks.
Switching between weapons: Pathfinder rules don’t explicitly prevent switching weapons between attacks during a full-attack action (if you have the actions available to do so, such as a free action to drop a weapon or a swift action to switch grips), but Whirlwind Attack doesn’t follow the same rules as a standard full attack.
Unarmed Strikes and Reach Weapons- If you’re using a reach weapon (like a glaive or long spear), your reach is typically 10 feet or more, and your melee attacks for Whirlwind Attack will use that reach.
If you attempt to switch to Improved Unarmed Strike during the same Whirlwind Attack sequence, the problem arises because unarmed strikes typically have only a 5-foot reach (unless you’re using something like a Monk’s Ki Reach or a similar ability).
This means the two attacks would have conflicting reach ranges, making them impractical to combine in the same Whirlwind Attack.
No Explicit “One Weapon” Rule, But the Mechanics Imply It
There isn’t a written rule that explicitly states “you must use the same weapon for all Whirlwind Attack strikes.” However, the mechanics of how reach, weapons, and unarmed strikes work imply that you cannot effectively mix attacks in this way without specific feats or class abilities allowing it. Without the ability to combine different weapon types in a single attack routine (which Whirlwind Attack does not provide), the feat effectively limits you to using one type of attack for all enemies within reach.
Summary Whirlwind Attack allows you to make one attack against each target within your reach.
By default, this attack uses the same weapon (or unarmed strike) for all enemies because it’s treated as one series of melee attacks in one full-attack action.
There’s no explicit rule saying “only one weapon can be used,” but the mechanics of reach weapons vs. unarmed strikes and how full-attack actions work make it impractical to mix the two types of attacks in this case.