relics/RelicShield.cs
using Sandbox;
using System.Reflection.PortableExecutable;
using System.Runtime.Versioning;
using System.Threading.Tasks;

public class RelicShield : Relic
{
	public override void LevelUp()
	{
		base.LevelUp();

		Manager.Instance.Stats[StatType.ShieldAmount] += 1f;
	}

	public override bool ShouldHandleEvent( EventType eventType )
	{
		return eventType == EventType.Mismatch && (int)Manager.Instance.Stats[StatType.NumMismatches] <= (int)Manager.Instance.Stats[StatType.ShieldAmount];
	}

	public override async Task HandleEventAsync(EventType eventType)
	{
		Manager.Instance.PushEventMessage( this, eventType );

		await Task.DelayRealtime( 250 );

		var camera = Scene.Camera;
		var ray = camera.ScreenPixelToRay( new Vector3( Screen.Width / 2, Screen.Height * 0.65f, 0f ) );
		var tr = Scene.Trace.Ray( ray, 10000f ).Run();

		Manager.Instance.PlaySfx( "shield_2", tr.EndPosition.WithZ( Scene.Camera.WorldPosition.z - Globals.CARD_SFX_DEPTH_DIFF ), volume: 0.7f, pitch: Game.Random.Float( 0.925f, 1.075f ) );

		Manager.Instance.SpawnFloaterImage(
			pos: tr.EndPosition,
			filename: Relic.GetIconFilename(RelicType.Shield),
			lifetime: 1.2f,
			velocity: new Vector2( 0f, 125f ),
			deceleration: 1.5f,
			startScale: 0.7f,
			endScale: 1.1f
		);

		Manager.Instance.ShakeCamera( 0.8f, 0.45f );
		Manager.Instance.ShowOverlayColor( Color.Gray.WithAlpha( 0.4f ), 0.5f );

		await Task.DelayRealtime( 750 );

		Manager.Instance.PopEventMessage();
	}
}