At the start of any Voidwatch battle, several weakness triggers are chosen and grouped into various levels. There will be six normal vulnerabilities 
, two high vulnerabilities 
, and one extreme vulnerability 
. Weaknesses are chosen randomly from any of the job or pet abilities, weapon skills, and spells listed in the tables below and hints to those weakness triggers are provided by various periapt items acquired fromVoidwatch Officers. Once a weakness is hit, it will be replaced randomly with the same level weakness (normal or high, extreme weaknesses can only be hit once per battle), but not necessarily the same kind of trigger (ability, weapon skill, or spell). Except on Ig-Alima and Botulus Rex, appropriate timing of the weakness trigger during a monster's TP move or spell cast will cause it to yield additional alignment bonus, temporary items, and/or duration. See the weakness section of the Voidwatch page for more information.
If a weapon skill, ability, or spell has no effect (except Dispel & Magic Finale), is completely resisted, or completely misses, it cannot trigger a weakness even if it is the vulnerability and must be tried again. For example, Poison and Poisonga cannot overwrite Poison II if it has already been applied, and so they cannot trigger weakness until the Poison II effect wears off. This can occasionally lead to impossible triggers in certain cases where a particular monster is immune to the weakness trigger chosen.
Job Ability Vulnerabilities
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Jobs not listed in the table below do not have any job abilities that can be weakness triggers.
Pet Vulnerabilities
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Offensive abilities acquired by beastmaster jug pets can trigger weaknesses. Reference the weakness message for the type of jug pet (leech, flytrap, diremite, etc.)
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Offensive wyvern breaths can trigger weaknesses. The element of the breath will be specified by the weakness message, leaving only one possibility.
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Offensive automaton special abilities can trigger weaknesses.
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Automaton weapon skills can trigger weaknesses (the frame with the weapon skill will be referenced in the message) and are grouped into the weapon skill table in the next section.
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Avatar blood pact weaknesses are specified by element and the possible triggers are listed in the table below:
Weapon Skill Vulnerabilities
Magic Vulnerabilities
, two high vulnerabilities 
, and one extreme vulnerability 
. Weaknesses are chosen randomly from any of the job or pet abilities, weapon skills, and spells listed in the tables below and hints to those weakness triggers are provided by various periapt items acquired fromVoidwatch Officers. Once a weakness is hit, it will be replaced randomly with the same level weakness (normal or high, extreme weaknesses can only be hit once per battle), but not necessarily the same kind of trigger (ability, weapon skill, or spell). Except on Ig-Alima and Botulus Rex, appropriate timing of the weakness trigger during a monster's TP move or spell cast will cause it to yield additional alignment bonus, temporary items, and/or duration. See the weakness section of the Voidwatch page for more information.