Create a Buff Blueprint

Buffs are components applied to characters at runtime. They modify stats and can tick over time.
All buffs derive from UBaseBuff.

1. Create the Blueprint

1. In the Content Browser, right-click → Blueprint Class.
2. Search for BaseBuff and select it.
3. Name it BP_Buff_<YourName> (e.g. BP_Buff_Haste).
4. Save it in Content/Blueprints/Buffs/.

2. Duration

Property	Category	Description
Duration	Stats › Time	How long the buff lasts in seconds. Set to 0 for infinite duration (until the character is destroyed).

3. Stat multipliers

All multipliers are applied multiplicatively to the owner's existing modifiers.

Property	Category	Effect	Example values
PassiveCooldownMultiplier	Stats	Modifies how fast passives fire	0.8 = −20% cooldown (faster), 1.2 = +20% (slower)
MovementSpeedMultiplier	Stats	Changes movement speed	1.3 = +30% speed, 0.5 = −50% speed
DamageResistanceMultiplier	Stats	Changes damage received	0.8 = −20% damage taken
HealingReceivedMultiplier	Stats	Changes healing received	1.5 = +50% healing
HealingDoneMultiplier	Stats	Changes healing done	1.2 = +20% healing given
PassiveDamageMultiplier	Stats	Changes damage dealt by passives	1.5 = +50% damage

Leave a multiplier at 1.0 to have no effect.

4. Ticking buffs

Use this when the buff should trigger repeatedly (e.g. damage-over-time, periodic AoE).

Property	Category	Description
IsBuffTicking	Stats › Time	Enable repeated triggering
TickCooldown	Stats › Time	Seconds between each tick

When IsBuffTicking = true, BuffTriggered() is called every TickCooldown seconds.
Override BuffTriggered() in your child Blueprint to add custom logic.

5. Icon

Property	Category	Description
Icon	Debug	Texture2D, recommended 128×128 px, shown on the UI.

6. Required buffs (combo system)

Property	Category	Description
RequiredBuffs	Stats › Interactions	List of buff classes that must already be active on the owner for this buff to apply. Leave empty for no requirement.

7. Apply a buff to a character

Buffs are added at runtime by calling AddBuff() on the character from another Blueprint or C++.

From a Blueprint node:

Target (ALesDeuxPelosCharacter) → AddBuff(BP_Buff_Haste::StaticClass())

Complete example — haste buff

BP_Buff_Haste
  Duration                   = 5.0
  MovementSpeedMultiplier    = 1.4   (+40% speed)
  PassiveCooldownMultiplier  = 0.8   (−20% cooldown)
  IsBuffTicking              = false
  Icon                       = T_Icon_Haste

Complete example — poison (ticking)

BP_Buff_Poison
  Duration          = 10.0
  IsBuffTicking     = true
  TickCooldown      = 1.0
  (override BuffTriggered to deal damage each tick)