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Then why is it named Blade and not Katara?

From the GMST extraction;

1st Unwelcome Guest Blade
Katara - Thieves only
Required Level: 47
Weapon Attack: +33
HP: +220
Faster(3)
7 Slots



2nd Unwelcome Guest Blade
Katara - Thieves only
Required Level: 67
Weapon Attack: +42
HP: +270
Faster(3)
7 Slots



3rd Unwelcome Guest Blade
Katara - Thieves only
Required Level: 87
Weapon Attack: +48
LUK: +1
HP: +330
Faster(3)
7 Slots



Last Unwelcome Guest Blade
Katara - Thieves only
Required Level: 107
Weapon Attack: +54
LUK: +1
HP: +390
Faster(3)
7 Slots



VIP Blade
Katara - Thieves only
Required Level: 127
Weapon Attack: +68
DEX: +4
LUK: +8
Fast(4)
7 Slots

GMS named them Blades as well.