He used KYBUR Crystal to amp his connection to the Force by 1000 X, he also used his own knowledge of what and how each ability fundamentally functions in order to find a shortcut to learning it, this doesn't mean he has Force Lighting strong enough to zap Yoda like Palpatine can, at best it can only destroy a dozen droids at once or render unconscious a dozen or so Clones but not kill them at his starting level of when he first learns it. Obviously he had years until the Clone Wars started to strengthen it so it can be Lethal, but he also did the same for all his Force Abilities not just one type.
Unlike characters like Sidious who when they learn Force Lighting it is instantly Lethal, you now know the comparison in how the strength and the consequences are for Dante's fast learning speed of Force Abilities. It means they are weaker to begin with and need more effort to develop to the same level of a proper Jedi with sufficient mastery of it. SO NO COMPLAINANTS THAT HE INSTANTLY IS OP!
1. Telekinesis
2. Force Push/Pull
3. Force Jump/Leap
4. Force Throw
5. Force Wave
6. Force Choke
7. Force Grip
8. Force Crush
9. Force Sphere
10. Force Orb
11. Force Lighting
12. Electric Judgement
13. Pyrokinesis
14. Cryokinesis
15. Force Sense
16. Precognition
17. Battle Precognition
18. Telepathy
19. Mind Trick
20. Mind Control
21. Drain Knowledge
22. Force Persuasion
23. Force Empathy
24. Animal Friendship
25. Animal Bond
26. Force Comprehension
27. Comprehend Speech
28. Farsight
29. Force Sight
30. Force Vision
31. Levitation
32. Force Speed
33. Force Jump
34. Force Listening
35. Force Smell
36. Force Body
37. Enhance Attribute
38. Enhanced Athleticism
39. Controlled Descent
40. Control Pain
41. Breath Control
42. Phase
43. Art Of The Small (Molecular Manipulation) - Only when using the KYBUR Crystal.
44. Biokinesis
45. Alter Environment