Lapis provides useful buffs to the character that summoned him and also assists the character during the battle. Lapis can summon all the characters regardless of character's level, class, and tribe. There are several types of Rubies in the game, check out the table below and where you can find them in the game, the most popular two increases HP or increases MP.
The maximum level for a Lapis is 30. Their level is not based on experience fighting monsters, but instead based on the amount of time that has elapsed.
Earning your first Lapis
Early on in the game, players receive one quests that give two types of Lapis to the player upon completion. Look out for the quest titled "Retrieving the Scattered Souls of Lapis - Acorn" to get started.
Egg of Lapis will be given after completing the quest.
Activating a Lapis
When you have a Lapis Egg to use, activate it from your inventory and check it out at the Lapis window by press "Y" on the keyboard.
When pressing "Y", the Rapis window pops up. You could have dragged the icon of Rapis into the bottom box in the window to activate Lapis. The Lapis window will always display the buffs and skills of the Lapis at the two boxes on the upper right.
The Lapis will appear floating near your character's shoulder.