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There are three artifacts available:

"Dargon" Tear (not sure if this is a typo or not)

Robe of Master

Nine Ring Sword

At 1 star, Dargon Tear "Once, increases friendly card's HP by 15% of their base HP."

The text is a little confusing, combining singular and plural forms, but I'm guessing that it increases the HP of all friendly cards on the field at the time the artifact is activated.

For 2 stars, it increases the HP by 40%. This is a little surprising, because usually the first step is the largest, but getting a second copy and upgrading this to 2 stars looks like a very good deal. However, it is possible that either the 15% or 40% figure is in error.

One nice thing about this artifact is that it appears to spread its effects across multiple cards - however, the trade off for such artifacts is that the effect is generally weaker.

At 1 star, Robe of Master "Once, increases HP and AT by 10%. Enemy effects don't affect the card."

For 2 stars, it increases the HP and AT by 20%. This could be a very important artifact in specific situations, such as attempting to get past an opposing deck where one card has a particularly devastating effect. Of course, it only protects the one card, but sometimes that is all that is needed to allow your other cards to strike.

At 1 star, Nine Ring Sword "Increases the card's AT by 15%, and has a 40% chance to strike again."

For 2 stars, it increases the card's AT by 20%.

Of course all these cards can be upgraded to 5 stars. At some point the person updating this page will give a full breakdown, but without better information - just guessing from the difference between 1 star and 2 star effects - I'd guess that Dargon Tear at 5 stars will increase either one random card's HP by as much as 120% (as Titan Armor does for itself) or perhaps increases HP by around 60% for all the cards on the field at the time the artifact is activated. It's really difficult to say, because the phrasing is a little muddled. I would guess with more confidence that Robe of Master will increase its own card's HP and AT by up to 50% or even 60% when upgraded to 5 stars - and of course still protect that one card from enemy card effects. I would also guess that Nine Ring Sword will increase its card's AT by 35% or 40%, while maintaining the 40% chance of a second strike each turn.

So, what would I recommend? Well, with a sufficiently strong deck it isn't terribly difficult to get all three cards up to 5 stars. It can be done with even a weak deck, but to be conservative figure a cost of about 40 gems for each chance to take another turn against Xiong and Xiang (this event's monsters). The weaker your deck, the more turns it will take - and the further you get, the stronger the opponent's deck will be.

But if I were starting out and had to choose, I would want to get Robe of Master even if only at 1 star, just in case an occasion arises where it is necessary to have at least one card immune to an opponent's artifact effect.

After securing that, the way things are set up this time the only other choice is Dargon Tear until you have enough artifacts sufficient for two stars - that is, two of one and one of the other.

And personally I would favor Dargon Tear because the size of the main effect is much larger, and I don't personally value the chance of a second strike very highly because it is not reliable. I like my cards reliable so I can predict how a battle will go and plan strategy accordingly. If I had a medium strength deck I would go for getting both Dargon Tear and Robe of Master up to 5 stars, and ignore Nine Ring Sword entirely. You can't work on getting just one card up to 5 stars in 5 attempts, because the game only gives you 2 choices after each victory, and after the third time around one of the choices will always be an artifact you have the least of - which is to say, it will exclude the artifact you have the most of. You can, however, focus on just getting two artifacts up to 5 stars (or as close as you can reach), and it should take no more than 10 or 11 victories against the monster. (Remember, one victory may require multiple turns, even 10 or more turns if you have a weak or medium strength deck.)

But, you may have different preferences - and you may want to wait until we get confirmation as to what exactly is the strength of the effects and how they work.