Requirements
The Requirements interface is a modal interface that appears when attempting to perform an action at a skill node with multiple requirements and the player only meets some of them.
Below level requirement
When attempting to interact with a skill node when below the minimum level for that node, a popup appears to display the minimum level requirement.
The main Requirements interfact
When interacting with a skill node that the player has the level requirement to use but without the required Equipment, Knowledge, and Items, the main Requirements interface opens to show all the requirements for that skill node.
Inventory full
If the player satisfies all of the requirements to interact with a skill node that produces more items that in consumes but has a full backpack, a popup appears to show that an empty backpack space is required.