The Ruby Sword has an inbuilt Triangle Adept skill built into it. This increases attack by 20% if the user is at weapon triangle advantage, or reduces attack by 20% if the user is at weapon triangle disadvantage. This effect does not stack with the skill Triangle Adept on either the user or enemy.
If unit has weapon-triangle advantage, boosts Atk by 20%. If unit has weapon-triangle disadvantage, reduces Atk by 20%.