This article's content is accurate to the most recent public game version, 0.4.8d.
"Evokes a gentle light that purifies the body of all poisons, diseases and toxins."
Cost: 2 MP
Source: Natalie - Unlocked in the Bee Hive after rescuing Tilia.
Cleansing Light is a spell that removes the poison status effect from a friendly target.
At a cost of only 2 MP, this is a very affordable alternative to using Seals of Purity. Unless there is an urgent need to remove the poison in the middle of battle consider doing it afterwards instead, since if the enemy has poisoned you once it could do so again immediately afterwards causing multiple cleanses tot become necessary. Having Natalie help offensively to end the battle sooner and then removing the poison afterwards may often be the more economical solution.