Basics

Soul Crystals, better known as SA (Special Abilities), gives the weapon additional properties.

On Lu4, Soul Crystals can be inserted into D, C, or B-grade weapons to obtain one of three effects. Dual weapons (swords, daggers, blunts) receive a specific SA effect from enchantment up to level 4 and above.

Soul Crystals cannot be inserted into weapons without a grade (NoGrade).

You can insert a Soul Crystal into a weapon by contacting a Blacksmith in any city.

Weapon grade	Crystal level	Gems
D-grade (low)	Red Soul Crystal - Stage 2 NG Green Soul Crystal - Stage 2 NG Blue Soul Crystal - Stage 2 NG	75 Gemstone D NG
D-grade (middle)	Red Soul Crystal - Stage 3 NG Green Soul Crystal - Stage 3 NG Blue Soul Crystal - Stage 3 NG	120 Gemstone D NG
D-grade (top)	Red Soul Crystal - Stage 4 NG Green Soul Crystal - Stage 4 NG Blue Soul Crystal - Stage 4 NG	150 Gemstone D NG
C-grade (low)	Red Soul Crystal - Stage 5 NG Green Soul Crystal - Stage 5 NG Blue Soul Crystal - Stage 5 NG	97 Gemstone C NG
C-grade (middle)	Red Soul Crystal - Stage 6 NG Green Soul Crystal - Stage 6 NG Blue Soul Crystal - Stage 6 NG	238 Gemstone C NG
C-grade (high)	Red Soul Crystal - Stage 7 NG Green Soul Crystal - Stage 7 NG Blue Soul Crystal - Stage 7 NG	306 Gemstone C NG
C-grade (top)	Red Soul Crystal - Stage 8 NG Green Soul Crystal - Stage 8 NG Blue Soul Crystal - Stage 8 NG	555 Gemstone C NG
B-grade (low)	Red Soul Crystal - Stage 9 NG Green Soul Crystal - Stage 9 NG Blue Soul Crystal - Stage 9 NG	222 Gemstone B NG
B-grade (top)	Red Soul Crystal - Stage 10 NG Green Soul Crystal - Stage 10 NG Blue Soul Crystal - Stage 10 NG	339 Gemstone B NG

You can remove the Soul Crystal from your weapon at the town Blacksmith.

How to upgrade the Soul Crystal?

To obtain a Soul Crystal of the required level, you need to infuse it with monster souls. To do this, purchase one of the level 0 crystals from the Blacksmith in any city.

In the Lu4 project, Soul Crystal leveling was reworked. To level up your Soul Crystal, purchase one of the level 0 crystals.

Blacksmiths will offer you an empty Soul Crystal in one of three colors: blue, green, or red. You can only purchase one crystal at a time. To purchase additional crystals, speak with the blacksmith again, but be careful — you only need one crystal in your inventory to upgrade a crystal.

To upgrade your Soul Crystal, find the required monster (see the table below) and kill it. You don't need to use the Crystal on the monster.

The chance of absorbing a soul isn't 100%, so for each crystal level, you'll have to kill anywhere from 1 to several dozen monsters.

Upgrade SA level 2-10.

Monster	Soul Crystal Level
Ol Mahum Captain Lv. 25	2
Langk Lizardman Leader Lv. 25	2
Cloudy Beast Turen Lv. 25	2
Ol Mahum Guerilla Lv. 26	2
Ol Mahum General Lv. 26	2
Turek Orc Footman Lv. 26	2
Kuran Kobold Lv. 27	2
Ol Mahum Sergeant Lv. 29	2
Turek Orc Shaman Lv. 29	2
Whispering Wind Lv. 33	2
Delu Lizardman Warrior Lv. 30	3
Lakin Salamander Lv. 30	3
Ant Captain Lv. 31	3
Ghoul Lv. 32	3
Kanil Succubus Lv. 32	3
Granite Golem Lv. 33	3
Ant Patrol Lv. 34	3
Marsh Stakato Drone Lv. 35	3
Delu Lizardman Shaman Lv. 35	3
Warlike Tyrant Lv. 35	3
Hatu Onyx Beast Lv. 36	4
Noble Ant Lv. 37	4
Ogre Lv. 38	4
Fettered Soul Lv. 38	4
Farhite Lv. 39	4
Lienrik Lv. 39	4
Porta Lv. 40	4
Hatu Windsus Lv. 40	4
Timak Orc Lv. 40	5
Nos Lv. 40	5
Timak Orc Archer Lv. 41	5
Blade Stakato Lv. 41	5
Light Worm Lv. 41	5
Great White Shark Lv. 42	5
Timak Orc Soldier Lv. 42	5
Blade Stakato Worker Lv. 42	5
Blade Stakato Warrior Lv. 43	5
Crokian Lad Warrior Lv. 43	5
Zaken's Pikeman Lv. 43	5
Timak Orc Warrior Lv. 43	5
Timak Orc Shaman Lv. 44	6
Timak Orc Overlord Lv. 45	6
Timak Orc Troop Leader Lv. 45	6
Water Giant Lv. 45	6
Forest of Mirrors Ghost Lv. 46	6
Queen Undine Lad Lv. 46	6
Unpleasant Humming Lv. 46	6
Light Bringer Lv. 46	6
Forest of Mirrors Ghost Lv. 47	7
Eva's Seeker Lv. 47	7
Death Flyer Lv. 47	7
Forest of Mirrors Ghost Lv. 48	7
Theeder Piker Lv. 48	7
Fiend Archer Lv. 48	7
Mirror Lv. 49	7
Theeder Mage Lv. 49	7
Musveren Lv. 49	7
Doll Master Lv. 50	7
Harit Lizardman Lv. 50	7
Zaken's Royal Guard Lv. 50	7
Garden Guard Leader Lv. 50	7
Harit Lizardman Grunt Lv. 51	7
Kaim Vanul Lv. 51	7
Harit Lizardman Archer Lv. 52	7
Pirate Zombie Captain Lv. 52	7
Doll Blader Lv. 53	8
Veil Master Lv. 54	8
Sairon Lv. 54	8
Maluk Succubus Lv. 59	9
Unicorn Elder Lv. 55	9
Spirit of Timiniel Lv. 58	9
Thunder Wyrm Lv. 56	9
Drake Lv. 57	9
Maluk Knight Lv. 62	10
Maluk Berserker Lv. 63	10
Maluk Lord Lv. 63	10
Limal Karinness Lv. 64	10
Karik Lv. 65	10
Pytan Lv. 64	10