[System Notification: Congratulations, Host. You have slain a Level 62 Striped Mana Bear.]
[You have gained 8000 Experience points. Due to the level difference, you have gained an additional 8000 EXP for killing it.]
[Rewards Obtained: Essence of Despair, Orb of Elemental Mastery, Elixir of the Forgotten King.
Val was already aware of the effect of the Essence of Despair as he had received it while hunting beasts and devils in the Shadow Valley, and he had sold it to a lucky someone when he visited the treasure pavilion of the Northern Frontier's Lower City.
As for what that change is, you'll know when the story reach that point!