Eureka:pyros and hydatos Critical Bug

Date & Time: N/A
Frequency: Always
World name: N/A
Character name: N/A
Retainer name: N/A
NPC name: N/A
Monster name: N/A
Class/Level: N/A
Party or solo: N/A
In-game time: N/A
Steps:
In Eureka:Pyros and Hydatos, If Players use low-level jobs(not Elemental level, the "real" job level<50) and apply Wisdom of the Platebearer in the meantime. They will become nearly invulnerable, only take 1 damage when under attack, due to their defense is increased by 3000 and the fundamental defense in low-level is significant small.