Drop quantity
The drop quantity bonus affects the quantity of base item drops.
The drop quantity bonus affects the quantity of base item drops.
The drop quantity bonus and additional drop quantity bonus do not apply to all drops. Refer to the corresponding gameplay for details on which drops are not affected by these bonuses (such as items obtained from Cubes of Rapacity, Dream Bubbles, Chests of Folklores, Splendor Eggs, etc.)

Calculation
Final expected drop quantity = Original expected drop quantity x (1 + drop quantity bonus 1 + drop quantity bonus 2 + drop quantity bonus 3 +...) x (1 + additional drop quantity bonus 1) x (1 + additional drop quantity bonus 2) x (1 + additional drop quantity bonus 3) x...
Note: The drop quantity does not affect the weight distribution of each item in the drop library.

The following are examples of drops in different situations:
Example 1: If a drop has a 100% chance to drop 1 item, and the item has a 100% chance to be a Flame Elementium, then with "+100% Drop Quantity," there is a 100% chance to drop 2 Flame Elementium.
Example 2: If a drop has a 100% chance to drop 1 item, and the item has a 100% chance to be a Flame Elementium, then with "+100% Drop Quantity" and "+100% additional Drop Quantity," there is a 100% chance to drop 4 Flame Elementium.
Example 3: If a drop has a 50% chance to drop 1 item, and the item has a 100% chance to be a Flame Elementium, then with "+100% Drop Quantity," there is a 25% chance to drop no items, 50% chance to drop 1 Flame Elementium, and 25% to drop 2 Flame Elementium.
Example 4: If a drop has a 50% chance to drop 1 item, and the item has a 50% chance to be a Flame Elementium and a 50% chance to be a Flame Sand, then with "+100% Drop Quantity," there is a 25% chance to drop no items, 25% chance to drop 1 Flame Elementium, 25% chance to drop 1 Flame Sand, 6.25% chance to drop 2 Flame Elementium, 6.25% to drop 2 Flame Sand, and 12.5% chance to drop 1 Flame Elementium and 1 Flame Sand.
Example 5: If a drop has a 100% chance to drop 1 item, and the item has a 100% chance to be a Flame Elementium, then with "-50% Drop Quantity," there is a 50% chance to drop no items and a 50% chance to drop 1 Flame Elementium.