"Unsheathes the hidden blade coated in poison. Damages one enemy, 50% chance for Poisoned."
Cost: 5 TP
Source: Wendy - Starting skill.
Umbrella's Hidden Blade is a skill that deals high 
Sharp damage with a 50% chance to inflict the 
Poisoned status effect to a single enemy target. This skill is unique in that it scales with both ATK and AGI, the total amount being fairly high.
Wendy's low ATK stat belies the strength of this move since it also scales with her AGI. As she actually has higher stats as a party character compared to as a boss, it works out much stronger when in the player's hands as opposed to when fighting against Wendy. Its damage aside, the skill's poison chance is quite noteworthy; all enemies in Eric(a)'s Memories except for the two bosses are susceptible to it. Remember that this includes Eric(a) should they face her as a boss.
The following enemy can cast Umbrella's Hidden Blade: