lightning slayer

so im trying to follow a lightning slayer build but my lightning strike right now is useless because it need multi strike and more support what should i use until i can get those?

LS is okay for levelling.

Try to get "Non-vaal strike skills target +1 additional enemy" from passive tree. When you attack, keep some distance between yourself and bosses so that you can hit the boss with a projectile and your mirage will hit it with melee. This doubles your DPS. Very few skills have a similar shotgunning effect in the game.

Try to get "Projectiles pierce +1 additional enemy" from passive tree. This helps your clear speed.

You do not need Melee Splash. You do not need Ancestral Call.

The other masteries that you should prioritze:

"Hits have 25% chance to treat enemies resistance as inverted" - This is a big damage bonus against bosses.

"Marked enemies have 10% chance to grant a frenzy charge on hit"

Your routine when you encounter a rare or unique monster:

Assassin's Mark - Cast this on the boss once and it will last a lifetime until you mark a different monster. Level 1-3 is sufficient. Don't overlevel because it has high mana cost and is hard to get Intelligence on slayer. After you complete Act 4, you can support this with Mark on Hit and Lifetap, and then it becomes automatic. Make sure you don't use other curses because there is "curse limit".

Sulphur/diamond/silver flasks - Until you are able sustain prismatic tincture, have 2 to 3 of these different flasks on your belt. Spam them whenever you see a boss. You have to manually spam them until you finish campaign whereby you will be awarded with Instilling Orb benchcrafting recipes to automate utility flask usage.

Decoy totem - You can use this until you are comfortable to tank the boss hits by yourself.