Yoda, who is a Jedi Master and Consular, takes on a specific posture to most effectively confront Count Dooku during Force-based combat.
Force forms constituted meditative combat stances. These stances provided other options besides the various styles of lightsaber combat. Every Jedi was taught to connect with the Force. Most lightsaber styles relied on this connection to some extent. However, Force forms amplified a Jedi's capacity to perceive and manipulate the Force. This allowed them to surpass typical limits during combat, but it came at the cost of physical prowess. These forms were favored by Jedi Consulars and others who leaned more heavily on the Force than lightsabers, even when fighting.
Around the period of the First Jedi Purge, there existed four primary Force forms:
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Force Channel—This form included the standard meditation methods that all Jedi learned. Channel was the only Force form generally used by those who weren't Consulars. Jedi Master Kreia called the technique "a gift" because it slightly improved one's connection without introducing any significant weaknesses.
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Force Potency—Potency had an inherently aggressive nature. It boosted a Jedi's ability to strike opponents using the Force. While this allowed for more powerful attacks, it quickly depleted the Jedi's energy. It was most suitable for those aligned with the dark side of the Force, since Force "attacks" often stemmed from hatred or other dark emotions. Nevertheless, a Jedi of the light could employ this form to swiftly resolve a conflict if speed was paramount.
Master Vrook Lamar is depicted here, teaching a student to use Force Affinity.
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Force Affinity—For Jedi needing to maintain a stable focus on the Force, Affinity was the best form. It let the Jedi sustain their connection even during intense combat, similar to how they would during peaceful meditation without distractions. This form allowed the Jedi to endure; they could stay guarded while their enemy wasted energy and grew tired. Because of this, it was most effective when used in rotation with other Force forms, allowing the Jedi to regain strength before launching a counterattack against an exhausted opponent.
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Force Mastery—Despite its grand title, the Mastery form wasn't exclusive to those with extensive Force expertise, although practitioners aimed to suggest that. A Jedi's control of the Force would indeed have more potent effects, enhancing their physical abilities for a sustained period while weakening the enemy's resistance to Force attacks. However, using this form significantly weakened the user, not only draining the Jedi but also impairing their ability to defend against the Force powers of others. Some individuals with limited Force proficiency would adopt this form to appear more skilled than they truly were. Padawan Darsha Assant demonstrated an example of Force Mastery in her final confrontation with Darth Maul. Despite being only a Padawan at the time of her death, Darsha managed to use some skill in Force Mastery to briefly mislead Darth Maul into thinking she was stronger than she actually was. Despite this, Darth Maul only realized the full scope of her deception at the last moment.
Unlike the lightsaber forms, the various Force forms only make an appearance in Star Wars: Knights of the Old Republic II: The Sith Lords. Furthermore, most of them are only available if the player chooses the Jedi Consular, Jedi Master, or Sith Lord class. Even within the game itself, the Force forms appear to be an afterthought. They aren't included in the game manual alongside the lightsaber forms, and dialogue in the game describes a dark-sided Jedi Exile learning the Jedi Masters' "lightsaber" techniques, even when they're using Force forms.