Awakened Astral Power Core of awakened astralness

When you use a sorcery point to metamagic a spell, you can choose to make a CON DC of 13 save. On a successful save you can teleport up to 20ft In a direction you choose and get temporary HP equal to [roll]1d12+5[/roll]. On a failed save you teleport 20ft away from your location in the opposite direction of the point you chose (so if i choose to teleport 10 feet forward I go 10 feet back, etc) but still get [roll]1d8+5[/roll] temp HP and cause a minor magical explosion, causing lightning damage equal to the Temp HP gained in a 20 foot radius around you. Creatures can do a Dex save to take half the lightning damage with a DC of 13