Making Skills Do Things (Costs | Events | Conditions)

A node is defined by its costs, conditions, and events. This section explains how to configure them.

A Note on Flexibility: While the plug-in comes with some built in options, you can create your own Events, Conditions and even Costs. We will go over these topics in the advanced sections.

Defining Costs (What Unlocking a Skill Node Costs)

In a node's Details panel in the Skill Tree Editor, find the Cost | Node Costs array.

Add a new element to the array by clicking the + icon.
Expand the new element and its Cost Definition.
Cost Source: Choose how the cost is paid.
- ActorIntegerProperty: Uses an integer variable on your character (e.g., a "SkillPoints" variable). You must provide the exact variable name in Actor Resource Property Name.
- GameplayAttributeValue: Uses an attribute from the Gameplay Ability System (e.g., Attributes.SkillPoints). You must select the attribute.
Cost Curve: You can use a CurveTable asset to define how the cost changes per level. If you leave this empty, it will use the flat CostAmount.

Creating Events (What Skill Nodes Do)

In a node's On Level Changed Events array, click + to add a new event. You can choose from several pre-made types:

Apply Gameplay Effect: The most common event. Applies a GameplayEffect to the character, perfect for passive stat boosts. You select the GE asset to apply.
Grant Gameplay Ability: Grants a GameplayAbility to the character.
Modify Character Float Property: Directly changes a simple float variable on the PlayerState, Character or its Movement Component (e.g., MaxWalkSpeed).

Creating Conditions (How to Unlock Skill Nodes)

In a node's Activation Conditions array, click + to add a new rule.

Parent Level Condition: Requires a specific parent node to be at a certain level. This is how you create dependencies in the tree. The parent MUST be at a higher "level" in the tree structure.
Resource Points Spent Condition: Requires the player to have spent a certain number of points of a specific resource type across all their trees. This variable is handle per UCrimsonSkillTreeManager.
Attribute Requirement: Requires a Gameplay Attribute to be greater than, less than, or equal to a certain value.

You can make some robust conditions using the built in AND/OR condition types which allow you to require multiple conditions to be true, or just one.