To get Observation Haki in Blox Fruits on Roblox, first, ensure your character is at least level 300. You also need to defeat the Saber Expert boss located in the Jungle.
Next, find the Instinct Teacher. Head to the last island and enter the small temple to teleport to Upper Skylands. Navigate through the enormous tree root to reach the second part of the Upper Skylands. There, you’ll find the temple with the Instinct Teacher.
Once you reach the teacher, talk to him. If you meet the requirements, you can purchase the ability for $750,000. This will grant you the Observation Haki.
To activate the ability, press “E” or “K” on PC or tap the Instinct button on mobile. Using Instinct allows you to dodge attacks, see enemies through walls, and view their health and energy levels. You can level up this ability during combat, increasing the number of dodges you can perform. Return to the Instinct Teacher to check your progress.