This is one of the best among vision cards.
There is no other vc that bestows AGI+ on the whole party members even on the JP server yet.
AGI is very important stat both in PvP and PvE.
Note that however, during the event period (since it's a limited time vision card), you also have to acquire enough shard of it to perform limit break for bring out the best in it.
UR Units & Tier List
Kilphe | Unit
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Upcoming Unit/Vision Card Release Schedule
FFI Death Machine Raid Event
Warrior of Light | Unit