FantasyAsset/Assets/Scripts/Abilities/AbilityClasses/FireballAbility.cs

using UnityEngine;

[CreateAssetMenu(menuName = "Abilities/Fireball")]
public class FireballAbility : Ability
{
    public GameObject projectilePrefab;
    public float speed = 22f;
    public float damage = 20f;
    public float lifeTime = 4f;

    public override void Activate(AbilityUser user)
    {
        if (!user || !projectilePrefab) return;

        Vector3 dir = Camera.main.transform.forward;

        //var go = Instantiate(projectilePrefab, user.CastPos(), Quaternion.LookRotation(user.Forward()));
        var go = Instantiate(projectilePrefab, user.CastPos(), Quaternion.LookRotation(dir));
        var rb = go.GetComponent<Rigidbody>();
        if (rb) rb.velocity = dir * speed;

        var dmg = go.GetComponent<ProjectileDamage>();
        if (!dmg) dmg = go.AddComponent<ProjectileDamage>();
        dmg.damage = damage;

        Destroy(go, lifeTime);
    }
}