Leeches was replaced by Esuna for balance reasons. Since Scholar evolves from a DPS class instead of a healing one is it has no low level healing spells besides Physick and pet abilities. EVERYTHING else is learned at 30+. That led to problems when you were trying to do dungeon like Toto-rak and Brayflox but couldn't cure poisons until level 40. Leeches was removes and replaced with Esuna as a role action to fix that issue.