Play animation montage on character with callback when finished

Pattern: EventBeginPlay or custom event → GetMesh → PlayMontage(MontageToPlay=AM_Attack, Rate=1.0) → Bind to OnMontageEnded delegate on AnimInstance for completion callback. Simpler approach: use Delay(Duration=MontageLength) after PlayMontage as rough callback. Key: PlayMontage is called on SkeletalMeshComponent (GetMesh()). Inputs: 'InSkeletalMeshComponent' and 'MontageToPlay'. Returns montage length as ReturnValue.

Server RPC — call a function on the server from a client

Create a Custom Event → check 'Replicates' in Details → set to 'Run On Server', 'Reliable'. Call from client → executes on server. Reliable = guaranteed delivery (use for important events). Unreliable = may drop (use for frequent updates like position).

Event Dispatcher: create, bind, and call with custom data

SETUP: In your BP, create an Event Dispatcher (e.g. 'OnPlayerDied') in the My Blueprint panel. BIND (in another BP): Get reference to actor → Bind Event to OnPlayerDied → connect a Custom Event as the target. CALL (in owning BP): Call OnPlayerDied (appears as a pink node) → this broadcasts to all bound listeners. Key: Event Dispatchers are called with 'Call <DispatcherName>' (not 'Broadcast'). Binding is done via 'Bind Event to <DispatcherName>' which has an 'Event' exec-like pin.

Client RPC — call a function on a specific client from the server

Custom Event → Replicates = 'Run On Owning Client'. Only executes on the client that owns this actor. Use for player-specific UI updates, messages, sounds.

SetTimerByFunctionName — set timer that calls a function

K2_SetTimer. Prefer SetTimerByEvent for type safety.

Multicast RPC — call a function on server AND all clients

Custom Event → Replicates = 'Multicast'. When called on server, executes on server and all connected clients. Use for visual effects, sounds, animations that all players should see.

EventAnyDamage — receive any type of damage

Custom Event

A user-defined event you can call from elsewhere in the same graph. Like a function but with an exec output for graphs.

Timer with Set Timer by Function Name for repeating actions

Pattern: BeginPlay → K2_SetTimer(Self, 'MyFunction', 2.0, true) → store TimerHandle. Stop: ClearAndInvalidateTimerByHandle(TimerHandle). Prefer SetTimerByEvent over FunctionName for type safety. Delay node is simpler for one-shot but only works in Event Graph.

Calling a function that doesn't exist on the target object

Why: You're calling '{fn}' on an object that doesn't have that function. The function may have been deleted, renamed, or moved to a different class. UE5 can't bind the call at compile time. Fix: Check the target pin's type. Search the Content Browser for the actual class name + look for '{fn}' in its functions. If found, drag a fresh reference and use the proper context menu Call Function path. If gone, find a replacement function or use an Interface call.