First, yes, but only once

Second, there are only like 2 or 3

Yes you must play through the Monoliths. Here's a Guide that tells you how to finish them easily:



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{Monolith II (Artika}
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The training begins with a message:

“The Snow Ninja are a mysterious clan of warriors who prey upon the
weakened souls of travelers. It is said that some of them fell from
the ranks of the powerful Tengu clan. Defeat the deadly ninja.”


1. With that many ninjas drop down. Defeat all of them so that the
blood in the skull meter on the right side of the screen fills up.
With them dead, a chest appears containing 1000 koins. A message asks
if you wish to continue your trials. You should continue the trials if
you wish to unlock the Arctika Arena that comes at the end of these
trials. If you select yes, Delia appears once again with another
message:

“The Snow Ninja are weakening, so they have called upon the Tengu
for assistance in defeating you. Destroy them quickly.”

2. With that many more ninjas drop down. Some are Tengu Grunts and
others are a bit harder. Use you Special Moves and take them all out,
trying to get them in bunches and using the Ground Pound. Open the
chest to get 1500 koins. Delia appears and says:

“Show the ninja no mercy. Unleash your fury on them – you now have
unlimited energy until they are all demolished! Use your special
powers to eliminate the Tengu and Snow Ninja clans.”

3. Ninjas drop down and you have unlimited energy. Use the Ground
Pound to get yourself some room and pick the rest off one by one using
the Fire Ball. The Fire Ball kills them in one hit pretty much making
this rather easy. Pick up the chest to receive 2000 koins. Delia
appears and says:

“The Snow Ninja have poisoned you! It is up to you to defeated them
all and find the cure.”

4. You are armed with a weapon, but you are poisoned, meaning your
health will gradually decrease. Use the powerful hammer to take out
foes and regain lost health. Continuously use the spin move (Attack 1)
to take out multiple enemies at once. Once they are dead, pick up the
chest for 2500 koins. Delia says:

“It is said that the Snow Ninja have the power to tame deadly yetis
and turn them into powerful allies.”

5. Two yetis then appear. You are granted the use of a sword
however, so make use of it. Just continue slashing away and they
should fall rather easily. Grab the chest for 2500 more koins. Delia
appears and says:

“Defeat the Snow Ninja clan before they defeat you. Only then will
you find the cure for their poison.”

6. This time you are poisoned, but are without the aid of a weapon.
Use your Special Moves to weaken them, and kill them off to regain your
energy meter. Once in a while, full regens for both health and energy
drop, so be on the lookout for those. Rinse and repeat. Grab the 3200
koins and continue training. Delia says:

“This is the final battle you will encounter in this obelisk.
Defeat the remaining ninjas and wipe out their clan forever.”

7. This is a straight up fight. Use Special Moves (gather a bunch
of them near you and Ground Pound, this should reduce their health so
low that a couple punches should do them in) to give you the advantage
and take out all the baddies and open the chest to earn ARENA –
Arctika. Delia appears and says she is done teaching for today. She
says take what you’ve learned and seek your destiny.

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{Monolith III (Netherrealm Cliffs) }
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Argus welcomes you back and says your training has only just
begun. He instructs Taven to stop the undead legion from feeding on
him.

1. The easiest way to do this is to Stop Time and then Ground Pound the
enemies away. Power-ups appear throughout to replenish lost energy.
Hurl a Fire Ball or two at an undead legion if he gets too close to
your father and you can’t get there in time. Throwing the undead into
one another cause them to hit other bad guys and fly further away.
Once that is completed, a chest appears containing 3200 koins. Grab it
and continue the trials. Argus appears saying:

“Contact with the undead has exposed you to their deadly plague. As
its effects grow stronger your flesh will burn and peel from your
bones! Maybe one of these abominations carries a cure...”

2. This battle is pretty tough. You are poisoned and constantly losing
health. This is where the almighty Fire Ball comes in. Since it can
kill more than one baddie per shot, makes sure you run around and shoot
it at a group of bad guys. Energy replenishments drop randomly for
when you run out. MAKE SURE you hit more than one guy at a time or you
will die from the poison. Grab the chest that appears to receive 2500
koins. Argus comes back saying:

“The spilling of blood and the stench of death have attracted the
attention of a terrible beast! Stand your ground and fight!”

3. With that, Motaro enters the fray! You face Motaro in an actual
fight. He is really tough! His moves do much more damage than regular
moves and the fight takes place on a multi-tiered arena. Most of his
moves are powerful enough to knock you off the starting platform and
down to the second one. Down here, if you are knocked off, it’s
instant death. Make sure you stay back and use Special Moves to
cripple him and dodge his slow moves; follow up with Drakesword combos.
When he is defeated, grab the chest that contains 2500 koins. Argus
appears once again saying:

“Past evils have been reborn! Do not let up until their souls have
been sent back to the abyss!”

4. This trial is difficult as hell too. Many bad guys spawn and you
have fill up your kill gauge to pass. It’s not as easy as it sounds
though as these guys RUN after you relentlessly attacking. Use the
same strategy as in trial 2. Also, make sure you take out the
reptilian guys first, because they spit that acid and it dazes you for
a moment. One last thing, if you knock a guy into the walls, you
regain some lost magic energy. Have some patience it just takes time.
Once they are dead, grab the chest that contains 3200 koins. Argus
appears again saying:

“From the abyss rises a powerful creature! Taven, send it back from
whence it came!”

5. We now have to battle Moloch in a regular fighting arena. He can be
pretty tough as well because his moves do more damage than usual and he
takes less damage per hit. He is slow though, so repeat strategies
from trial 3. With Moloch dead open the chest that appears for 3200
more koins. Argus appears for the final time saying:

“Finally, the end is near and the rage burns in your soul! Use the
flaming sword and unlimited firepower to clear the remaining undead
from this realm!”

6. Finally, an easy trial! With unlimited magic energy and this
powerful flaming sword, go to work on these bad guys. Overuse your
Special Moves to end this trial quickly. One completed, open the chest
that appears to receive ALTERNATE COSTUME – Sindel.


Hope that Helps.

you only have to play through the first one, but the second one and beyond aew optional.

There are 4 monoliths in konquest, the first one in the botan jungle is kinda easy, it's like just to show you the moves. The others you can skip them . Some challenges are kinda hard but there is always a strategy to use to make it a lot easier. If you complete them all , you will finish your konquest with maybe 20000 more koins gained through all the exercises accumulated, you can also get the sindel alternate costume and the arctica arena by finishing some of them , but you can get them by buying them in the krypt or get all 60 relics. You don't get anything new from completing them. I would say what is really important in konquest if you want completion is getting all 60 relics. Also one of the monoliths is "hidden " inside a rock crate in the netherrealm.