Isma's Tear

Isma's Tear is an Ability in Hollow Knight. It allows swimming in acid without taking damage.

Function
Albeit very useful, Isma's Tear is not necessary to complete the game. Obtaining it allows access to the following: It is also useful while exploring Fog Canyon and fighting Uumuu.
 * Shape of Unn in Greenpath
 * Access to Fog Canyon through Forgotten Crossroads or Fungal Wastes
 * A Grub in Isma's Grove
 * Access to Queen's Gardens
 * A Grub as well as a shortcut in Kingdom's Edge

How to Acquire
Located in Isma's Grove in the Royal Waterways. Requires Crystal Heart and beating Dung Defender in order to access this area.

Trivia

 * In the game files, this ability is referred to as "Acid Armour".
 * Dung Defender refers to it as "Isma's Blessing".

References

Слеза Исмы La larme d’Isma Łza Ismy