It is held for 500 years (50 years per Tournament) created by the Elder Gods as a way of keeping realms in check and as a defense if Outworld grew in power.

Except Mortal Kombat 1, the Tournament has had its fair share of history.

The sacred Mortal Kombat Tournament is held once a generation with two distinct stipulations: The Conquering wins 10 Tournaments and merges while the Defending Realms win 10 and save it.

Reiko does indeed serve both armies since he was a prominent member of the Brotherhood of Shadow when Shinnok was its God.

Depends on who is more ruthless

Reiko is a servant and General to both Shao Kahn's and Shinnok's armies during their conflict with Earthrealm.

Argus had an elicit affair with Amara before Taven and Daegon were born with Delia making him as well as the other two brothers in general.

Rain's ending in MK11: Ultimate says it all 

If Delia is Taven and Daegon's mother, and Rain is her son-in-law, who was Rain's actual mother?

Cassie Cage is the daughter of Johnny Cage and Sonya Blade, Jacqui is the daughter of Jax Briggs, Kung Jin is the cousin of Kung Lao, and Takeda is the son of Kenshi and the disciple of Scorpion (Hanzo Hasashi)

Cassie Cage, Kung Jin, Takeda Takahashi, Jacqui Briggs

Lin Kang, Chan Lao, Jake Briggs, Carol Cage

Rai-Yun, Xiang Li, Gordon Anderson, Moesha

They are the respective children/disciples/relatives of related Mortal Kombat Characters (Sonya and Johnny Cage, Jax, Kenshi, and Kung Lao)

Name the four of the "Next-Generation" of Earthrealm's defenders in Mortal Kombat X/XL.

Mortal Kombat was first unleashed in 1992 by Co-creators Ed Boon and John Tobias and spawned an incredible franchise that lasted over 3 decades.

It started in development after the success of Street Fighter II and gave the creators an Idea.

In what year did Mortal Kombat begin to become a franchise since?

Before Kerri Hoskins, Elizabeth Malecki was the first to portray Sonya before the disagreements between Midway and the other actors like Ho Sung Pak, Daniel Pesina were involved in the lawsuit which was settled out of court in 1995.

By the term "portrayal" they meant using digitized actors to portray their characters

Before Kerri Hoskins took on the role of Sonya Blade in Mortal Kombat 3 Onwards, who was the original actress who portrayed the character in the first game?

The answer is that Quan Chi sees Shinnok as a powerful God, because the other Lords and Ladies of Hell were unable to unite the realm as it was in complete disarray.

Because Quan Chi thought that Shinnok could be his weapon to rule

Because Quan Chi wanted to rule by his side and he sees him as a leader

Because Shinnok believed that Quan Chi only used him.

Shinnok wants to know the question.

In Mortal Kombat Mythology, why did Quan Chi help Shinnok rule over the Netherrealm after his banishment?

He first uttered the iconic catchphrase in the 1995 film adaptation of Mortal Kombat by Cary Hiroyuki-Tagawa and since then, it became a staple of the franchise and its character.

He's a sorcerer (no, It's not Quan Chi/Shinnok/Shao Kahn)

Guess the character by his catchphrase: "Your Soul is Mine!"

The answer is that the Lin-Kuei and Shirai Ryu were rivals in both respected countries (Lin-Kuei in China and Shirai-Ryu in Japan).

From the beginning, they were enemies to Rivals, to respected Grandmasters in the NRS Continuity

In Mortal Kombat Mythology, Scorpion and Sub-Zero became Grandmasters when they were once rivals and members of which Clans?

It shares the same element as the other mythological figures (Thor and Zeus)

In Mortal Kombat Mythology, Raiden is the God of what particular Element?

They have the same race

What species in Mortal Kombat Lore do both Khameleon and Reptile share?

By those terms, I mean which actor who portrayed the character

In the 1995 Mortal Kombat movie, which Character and Actor became the ultimate Scene Stealer?

Reptile first made his appearance in Mortal Kombat in 1992 as a fusion of Scorpion and Sub-Zero as a secret unplayable character (Yellow as Scorpion, Blue as Sub-Zero) before he became a separate playable character in Mortal Kombat II in 1993

It's a mix of colors

Before Reptile became a separate playable Character in Mortal Kombat II, Reptile made its first appearance in Mortal Kombat in 1992 as a fusion of what?

Noob Saibot is actually Bi-Han, because after his death at the hands of Scorpion after Liu Kang won the Mortal Kombat Tournament, he descended into the Netherrealm free from compassion.

Harumi Hasashi (Scorpion (MK1 Invasions))