Specific items/weapons needed to have a number of kills when worn. And once worn DO NOT remove the weapon or item that you are about to unseal otherwise you may have to start over. And most people say there's no worries about switching to other weapons or units. But they're wrong. And once the item has reached that many kills, go to to Menu>Items>Bag and select the item you are going to unseal and select the "USE" option. You will then unseal an item.

Here are the list of items you can unseal into their TRUE form:
Lame D'argent --> 10,000 Kills --> Excalibur
Sealed J-Sword --> 23,000 Kills --> Tsumikiri J-Sword
Proof of Sword-Saint --> 20,000 Kills --> Swordsman Lore
Limiter --> 20,000 Kills --> Adept


Combining items into cooler weapons or armor that can help you improve ATP and/or MST for weapons and DFP and EVP for armor. You will need a certain weapon/armor and a material to make an improved item.

You must be at least Lv100-140 for certain combination.

Here are the list of materials you can combine:

WEAPONS:
Monkey King Bar (Max Grinded) + Blue Black Stone + Hunters 800 ATP = Black King Bar
Slicer Series (Max Grinded) + Magic Stone "Irista" + 570 ATP = Rainbow Baton
Frozen Shooter (Max Grinded) + Photon Booster + Ranger 162 ATA= Snow Queen
Flame Visit (Max Grinded) + Photon Booster + Ranger 164 ATA = Burning Visit
Maser Beam (Max Grinded) + Photon Booster + Ranger 160 ATA = Power Maser
Panzer Faust (Max Grinded) + Photon Booster + Android Ranger 182 ATA = Iron Faust
Wand Series (Max Grinded) + Magic Rock "Heartkey" + Force 800 MST = Magical Piece
S-Berill's Hands #0 (Max Grinded) + Berill Photon + Hunter 600 ATP = S-Berill's Hands #1
Lavis Cannon + Syncesta + Hunter 850 ATP = Lavis Blade
Lavis Blade + Syncesta + Hunter 900 ATP = Double Cannon
Double Cannon + Syncesta + Hunter 900 ATP = Lavis Cannon (You can use Syncesta repeatedly, there's no limit)
Sword Series (Max Grinded) + Parasitic Gene "Flow" + Hunter 971 ATP = DARK FLOW
Shot Series (Max Grinded) + Parasitic Gene "Flow" + Ranger 190 ATA = DARK METEOR
Rod Series (Max Grinded) + Parasitic Gene "Flow" + Force 900 MST = DARK BRIDGE
Hitogata (Max Grinded) + Book of Hitogata + Force 900 MST = Dancing Hitogata
Handgun: Guld + Handgun: Milla + Ranger 190 ATA = Guld Milla
Plantain Leaf + Magic Water + Force 630 MST = Plantain Fan
Fatsia + Magic Water + Force 690 MST = Plantain Huge Fan
Handgun Series + Parts of Eggblaster + Ranger 140 ATA = Egg Blaster
Sange + Yasha + Hunter 800 ATP = Sange&Yasha
Branch of Paku Paku + Chao Mag + Force 695 MST = Striker of Chao
Heaven Punisher + Ophelie Seize + Ranger 210 ATA = Mille Martuex
Wand Series (Max Grinded) + Force 670 MST = Twinkle Star

ARMOR:
Spirit Garment + Magic Rock "Moola" + Lv152 (NO ANDROIDS) = Aura Field
Spirit Garment + Star Amplifier + Lv111 = Brightness Circle
Spirit Garment + Magic Rock "Heartkey" + Females Lv131 = Love Heart
Love Heart + Magic Rock "Heartkey" + Females Lv131 = Sweetheart
Invisible Guard + Magic Rock "Heartkey" + Females Lv131 = Safety Heart
Spirit Garment + Chu Chu Mag + Lv101 = Chu Chu Fever
Stink Frame + Parasitic Cell Type-D + Lv54 (NO ANDROIDS) = Parasite Wear: De Rol
Parasite Wear: De Rol + Parasitic Cell Type-D + Lv66 (NO ANDROIDS) = Parasite Wear: Nelgal
Parasite Wear: Nelgal + Parasitic Cell Type-D + Lv89 (NO ANDROIDS) = Parasite Wear: Vajulla
Parasite Wear: Vajulla + Parasitic Cell Type-D + Lv156 (NO ANDROIDS) = Virus Armor: Lafuteria

Conclusion: If you have any problems of combining these items into cool weapons or armor, please PM me. You can always go to Ragol.co.uk Item Combination Guide for more information of combining items.