Starkiller is more deadly in this sequel and you can make him more destructive by upgrading his skills and weapons with the holocrons you can find in the game.
You can upgrade your skills, and weapons in the game using the experience points, saber crystals, and bacta tanks scattered. There are total 45 holocron that you can find in the game, each specified below with a brief description of where you can find it.
1# Saber Crystal
You will find it in front of you after force gripping the platform to get across the gap, you can’t miss it.
2# Saber Crystal
Right after first Saber Crystal, when you are running throw the fires and do a dash to evade two stormtroopers attacking you, its behind them. Another easy to get.
3#Green Bacta Tank
After second Saber Crystal, when you come across a circular area with TIE Fighters shooting at you, it’s on the platform to the left.
4# Experience Point
When you pass through the forcefield, throwing objects at the red terminals, you will find it on the table in the middle of the next room.
5# Experience Point
In your first encounter with the Jumptroopers, you will find it near the first jumptrooper over the gap.
6# Blue Bacta Tank
Just when you defeat the second mech, you will find it on the door to your left.
Cato Neimoidia: The Eastern Arch
7# Saber Crystal
After you have defeated the Sith Acylote, go to the left platform with all the crates.You will find this holocron behind the crates.
8# Experience Point
After you have raised the platforms, you will find this holocron right next to the highest platform where you jump to continue your game.
9# Saber Crystal
You will find it on your left when you force push open the second door.
10# Saber Crystal
Just after the jumptroopers spawn with two red force fields, go to the next room with the bowling ball. Move the bowling ball and get this crystal.
11# Blue Bacta Tank
Your first encounter with the gunship, while crossing the bridge you will see it in the middle hanging in the air. Can’t miss it.
12# Green Bacta Tank
Just when you blast open the doors after bridge sequence, you will find it in front of you on a walkway next to Stormtrooper sniper.
13# Experience Point
In the casino area with the game machines, you will find it on the walkway farthest to your fight, right in the middle, just like previous holocron.
Destroy the 3 game machines in front of Jabba the Hutt hologram and it will spawn this costume holocron.