give @s[tag=lv50] tm:dual_blades 1
playsound random.levelup @a
tellraw @s[tag=lv50] {"rawtext":[{"text":"§eYou have unlocked the dual blade skill!"}]}
tellraw @s[tag=!lv50] {"rawtext":[{"text":"§cYou must be level 50 to unlock this skill!!"}]}
