How do you unlock and upgrade Arthur’s Dead Eye ability?

Arthur Morgan''s Dead Eye ability is a core gameplay mechanic in Red Dead Redemption 2 that allows players to slow down time, mark multiple targets, and execute precise shots. This ability is unlocked early in the game during the mission ''Old Friends'' in Chapter 1, where Arthur is introduced to Dead Eye during a shootout. From there, the ability evolves through five levels, each offering new features and enhancements. To unlock and upgrade Dead Eye, players must progress through the story, complete specific challenges, and gain experience.\n\nAt Level 1, Dead Eye allows players to slow down time and manually aim at targets. This is useful for taking out enemies in quick succession. To progress to Level 2, players must complete the mission ''The First Shall Be Last'' in Chapter 2. At this level, Dead Eye introduces the ability to automatically mark targets while aiming. This is particularly helpful in chaotic gunfights, as it allows players to tag multiple enemies before firing.\n\nLevel 3 is unlocked during the mission ''Pouring Forth Oil'' in Chapter 2. This upgrade adds the ability to manually mark targets by pressing the right stick (on consoles) or the corresponding key on PC. This feature gives players more control over which enemies to target, making it ideal for precision shooting. To reach Level 4, players must complete the mission ''A Short Walk in a Pretty Town'' in Chapter 3. At this stage, Dead Eye highlights critical areas on enemies, such as the head or heart, allowing for more lethal and efficient shots.\n\nLevel 5, the final upgrade, is unlocked during the mission ''Goodbye, Dear Friend'' in Chapter 4. This level enhances Dead Eye by allowing players to see the trajectory of bullets, making it easier to line up long-range shots or hit moving targets. Additionally, Dead Eye duration is extended, giving players more time to plan their attacks. To maximize the effectiveness of Dead Eye, players should use tonics like Snake Oil or Potent Snake Oil, which replenish the Dead Eye meter.\n\nTo gain experience and improve Dead Eye, players should engage in combat frequently. Hunting animals, completing side missions, and participating in shootouts are excellent ways to build experience. For example, hunting legendary animals or clearing out enemy camps can provide significant experience boosts. Additionally, using Dead Eye in combination with specific weapons, such as the Springfield Rifle or Schofield Revolver, can yield better results due to their accuracy and damage output.\n\nOne common challenge players face is managing the Dead Eye meter, which depletes quickly during intense combat. To address this, players should always carry tonics and consume food items like Big Game Meat, which replenishes the meter. Another tip is to use Dead Eye strategically, such as during ambushes or when facing multiple enemies, rather than relying on it for every encounter. This ensures the meter is available when needed most.\n\nIn summary, unlocking and upgrading Arthur''s Dead Eye ability requires progressing through the main story, completing specific missions, and gaining experience through combat and exploration. By mastering Dead Eye and using it strategically, players can dominate gunfights and overcome even the toughest challenges in Red Dead Redemption 2.