Forgot to add some things

LevelComponents/Killfloor.gd

@@ -0,0 +1,4 @@
+extends Spatial
+
+func on_player_enters(player):
+	player.rpc("kill")

LevelComponents/Killfloor.tscn

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+[gd_scene load_steps=3 format=2]
+
+[ext_resource path="res://LevelComponents/Killfloor.gd" type="Script" id=1]
+
+[sub_resource type="BoxShape" id=1]
+extents = Vector3( 100, 1, 100 )
+
+[node name="Killfloor" type="Area"]
+script = ExtResource( 1 )
+
+[node name="CollisionShape" type="CollisionShape" parent="."]
+shape = SubResource( 1 )
+[connection signal="body_entered" from="." to="." method="on_player_enters"]

LevelComponents/SpawnPoint.gd

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+extends Spatial
+
+func spawn(player):
+	player.translation = player.get_parent().to_local(global_transform.origin)
+	player.velocity = Vector3()

LevelComponents/SpawnPoint.tscn

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+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://LevelComponents/SpawnPoint.gd" type="Script" id=1]
+
+[node name="SpawnPoint" type="Spatial"]
+script = ExtResource( 1 )