Here is a list of how long the waiting time is for the rares on Siren Isle to spawn once it has been killed.
There are rares scattered around the island during the normal phase and also other types of rares during the storm phase. The rares in the storm phase will always be the same tipe of rares in the storm phase. But, in the normal phase, there are 3 rares that will swap each week, based on what type of mobs are on the island (Vrykul. naga, pirate).
All these rares have different spawn time and also different amount of Flame-Blessed Iron.
Warning: When you kill a rare the first of the day, you will get 100% currency loot. But, if you kill the same rare again with the same character, on the same day, you will get approx 50% currency loot.
These mobs are in the normal phase of the island (non-storm)
Normal Phase (Non-Storm)
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Snacker
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Flame-Blessed Iron: 89
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Spawn Time: Several hours (probably bugged)
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Ghostmaker
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Flame-Blessed Iron: 88
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Spawn Time: 90 minutes
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Ikir the Flot
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Flame-Blessed Iron: 182
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Spawn Time: 6 minutes
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Grimgull
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Flame-Blessed Iron: 67
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Spawn Time: Ping pongs between 28 minutes and 8 minutes
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Wreckwater
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Flame-Blessed Iron: 28
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Spawn Time: 7 minutes
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Asbjorn
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Flame-Blessed Iron: 118
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Spawn Time: 12 minutes
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Bloodbrine
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Flame-Blessed Iron: 110
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Spawn Time: Not specified
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Siris the Sea Scorpion
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Flame-Blessed Iron: 89
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Spawn Time: 15 minutes
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Corallweaver
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Flame-Blessed Iron: 95
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Spawn Time: 12 minutes
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Storm Phase
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Slaughtershell
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Flame-Blessed Iron: 58
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Spawn Time: 6 minutes
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Brinebough
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Flame-Blessed Iron: 28
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Spawn Time: 14 minutes
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Tempest Talon
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Flame-Blessed Iron: 22
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Spawn Time: 8 minutes
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Zek'ul the Shipbreaker
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Flame-Blessed Iron: 74
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Spawn Time: 6-7 minutes
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Ksvir
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Flame-Blessed Iron: 23
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Spawn Time: Not specified
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