Kanaxai, Scythe of House Aurkus (Silent Surf Fractal): 25572 normal mode
25577 challenge mode
Dagda (Cosmic Observatory Strike Mission):
25705
Cerus (Temple of Febe Strike Mission):
25989
Also changed "Siax the Corrupted" to just "Siax" to be less specific, because the normal mode and challenge mode bosses share the same ID but have different suffixes.
Also changed the icon for WvW encounters to Chest of the Mists icon for better visibility at small size.
Added boss IDs and icons to gamedata.json:
Kanaxai, Scythe of House Aurkus (Silent Surf Fractal): 25572 normal mode 25577 challenge mode
Dagda (Cosmic Observatory Strike Mission): 25705
Cerus (Temple of Febe Strike Mission): 25989
Also changed "Siax the Corrupted" to just "Siax" to be less specific, because the normal mode and challenge mode bosses share the same ID but have different suffixes.
Also changed the icon for WvW encounters to Chest of the Mists icon for better visibility at small size.