Healers, Knights, Monks, Priests and Valkyries have a special +2 success bonus (+3 for Healers) for six "emergency" spells:
Rangers have a special -2 failure penalty, and Tourists -1, when casting these spells.
For Archeologists, Barbarians, Cavemans, Rogues, Samurais and Wizards these spells have no "emergency" bonus or penalty to casting.
See Spellcasting for details.