After the Magna, now the LG Spirit has started receiving the Marshmallow update. Bringing Android version 6.0, the update is currently hitting 4G units of the device (model number: H440N) in several European countries, including Greece.
Aside from the usual Marshmallow goodies (such as Doze, Google Now on Tap, and redesigned app permissions), the update also includes the Android security patch for the month of May.
As is usually the case with OTA roll-outs, it may take sometime for the update to hit your device. Meanwhile, if you feel impatient, you can check for it manually by heading to your handset's Settings menu.