To unlock the map, you will need to find an island hidden in the exclusive biomes. Most players will probably already have it by this point, but the Spider rune is necessary to navigate the traps of the hidden island. You will need this before trying to get the Friend of the Singing Sword. You'll also need to take out a mini-boss enemy, so heal yourself before entering the Serenade vault. Find out how to find it in the quick guide below.
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To find Serenade, a flying (and speaking) swordsman, you will need to free him in the Fractured Sanctuary Biome. This biome can be accessed via an elevator right after defeating one of the first boss encounters. The Fractured Shrines is the first biome exclusive to the .
Once you reach the Fractured shrines, you must then locate a portal where it is it is raining. The rain reveals a secret - if you look closely you can see invisible platforms in the rain. Watch where the rain bounces off the invisible surfaces above.
Follow the invisible surfaces until you reach a room guarded by a Mini-Boss of the Stone Guardian - you also need the Spider rune to access this island. After going through the trap and defeating the Stone Guardian, you will be able to access a unique treasure chest.
The safe contains Serenade - a new skills plan that fits into your locations. To permanently unlock it, you need to provide the blueprint. The skill summons a talking flying sword that marks enemies for a Critical Strike. It's a strange little weapon that cannot be unlocked in any other way. You owe it to yourself to get this thing.
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