You will face numerous threats in Diablo Immortal as you explore the dark world of Sanctuary. This is tracked through the in-game Bestiary, which can be leveled up. This may leave you wondering how to level up and fill out your Bestiary in Diablo Immortal.
How to fill in your Bestiary in Diablo Immortal
To level up and fill out your Bestiary in Diablo Immortal, you must defeat various monsters and collect Monstrous Essence. You will need 10 Monstrous Essence before going to a Horadic Altar. Here, you can turn in your Monstrous Essence and collect a new page for your Bestiary.
You can collect Monstrous Essence as a random drop from defeating monsters throughout the world. However, this drop rate can be low, so you may need to farm monsters. Or, you can opt to passively collect them by simply playing through the game and gathering them when they drop. Using a strong PvE class will speed this process up.
How to unlock the Bestiary
You will unlock the Bestiary as part of the main quest, specifically The Horadric Bestiary quest in the Dark Wood. You must interact with an altar where a tome is resting. This is the Bestiary, and it will now be added to your menu.