World of Kharros
During a storm the clouds become a thick almost inky black, any cracks in the sky stares into a purple void of pure magic. Lightning of different colours can be seen streaking across the sky and slamming into the ground. once every 3 rounds a dex saving throw DC 13, Any one hit by the lightning takes 1d6 lightning damage and if they survive there is a 10% chance of gaining magical abilities.
on a 98-100 the character can become a sorceror
on a 96-97 the player gains 3 sorcery points and a random metamagic for 24 hours
on a 94-95 gain a random cantrip from the sorceror spell list for 2d4 days
on a 92-93 gain a random 1st level spell from the sorceror spell list for 24 hours
on a 90-91 regain an expanded 1st level spell slot (1 slot for warlocks)