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D&D Terminology: 20-Sider
In the realm of Dungeons & Dragons (D&D), the term "20-sider" refers to a 20-sided die, also known as a "d20." This iconic polyhedral die is one of the core components of the game and plays a central role in determining the outcomes of various actions, checks, and combat in the game world.

Key Points about the 20-Sider (d20):

1. Polyhedral Dice: The d20 is one of several polyhedral dice used in D&D, each with a different number of sides. The d20, with its 20 sides, is among the most frequently rolled dice in the game.

2. Rolling for Success: In D&D, players use the d20 to determine the success or failure of various actions, from attacking an enemy to attempting a skill check or saving throw. The result of the roll is added to relevant modifiers to determine the final outcome.

3. Critical Hits and Failures: Rolling a natural 20 on a d20 is often considered a "critical hit," indicating an exceptionally successful action, such as landing a devastating blow in combat. Conversely, rolling a natural 1 on a d20 can result in a "critical failure" or mishap, depending on the Dungeon Master's discretion.

4. Advantages and Disadvantages: In 5th Edition D&D, players may have advantage (rolling two d20s and taking the higher result) or disadvantage (rolling two d20s and taking the lower result) based on various circumstances. This mechanic introduces additional complexity and uncertainty to the game.

5. Skill Checks and Saving Throws: The d20 is often used for skill checks, where a player attempts to perform a task requiring skill or expertise. It is also used for saving throws, where characters try to resist the effects of spells, traps, or other hazards.

6. Critical Hit Confirmation: Some editions of D&D require a confirmation roll after a natural 20 to determine whether the result is a true critical hit. This additional roll helps balance gameplay and prevent excessive critical hits.

7. Customization: D&D players may have multiple d20s in various colors or designs, allowing them to choose dice that suit their character or preferences.

Roleplaying and Excitement:
- Rolling a d20 can be a dramatic moment in the game, as it often determines the fate of a character or the success of a crucial action.
- Players may engage in elaborate rituals or superstitions when rolling the d20, believing that specific dice-rolling techniques can influence the outcome.

In summary, the 20-sider, or d20, is a fundamental component of Dungeons & Dragons, used to resolve a wide range of actions, checks, and combat outcomes in the game. Its role as a primary randomization tool adds an element of unpredictability, excitement, and drama to D&D gameplay, making it a symbol of the game's essence.

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