Soul Knowledge (3.5e Sacrifice)
From D&D Wiki
The dead know many things forbidden and lost. By drawing on their knowledge and experiences, you become a master at identifying the fell beasts which have slain so many others. You may make a Knowledge check untrained to identify an enemy, with a +10 insight bonus on the roll. If successful, you not only divine the enemy's properties, but also it's current hp and status (such as poisoned, dazed, and more). If you fail to identify the creature, you may try again with another casting, but you gain no information.
Health Cost: -11.