What if there are 4 actors? What if there are 100? What if you do not know the index? This is bad advice.
I am casting from my player to an actor but what should i connect into object on cast node?
Perhaps you could expand on this. The way of obtaining a reference (so casting can happen) depends on what is going on. So what is happening? How is the player supposed to know which actor? Are we looking at it? Touching it? It’s in the player’s inventory? Some other interaction?
Perhaps there’s only 1 of those actors in the world, ever; and Get Actor of Class could work. Crude, but hey, it’s your game. 