Kris, the 6th Determination card and 1st DT card from Deltarune, was added in Beta 30.0. Previous Versions can be found here.
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Dark Knight
With Kris on the board, your entire team will power up with each attack, giving the attacking monster +1/+1 for each other ally monster on the board, with a max of 2.
Keep in mind that Kris doesn't benefit from this effect itself, but since it will count towards the needed other monsters, any of your other monsters that attacks will get +1/+1 or +2/+2 before the attack hits its target, dealing more damage and be more likely to survive the counterattack.
This makes Kris a perfect support card, and due to it being Determination, its effect can't be silenced either.
Kris can be used with other support monsters like Hathy to increase a monster's attack by 3 and Ralsei to make the monster immune to damage when attacking. If combined with Hathy and the Veteran Artifact, a monster can gain up to 4 attack and 2 health each time it attacks an enemy.
Kris is very effective when used with low cost, Charge monsters like Temmie and Ice Cap as they can deal a lot of damage. This makes Kris quite good in Bravery decks.
The way to counter Kris is through cards that remove it from the board such as Endogeny, Expulsion, and Dimensional Box. It can also be removed from the game by changing it into another card through the use of Chaos Duck .
No other card shares the same cost as Kris will be changed into a base Kris if Red Bird is used on it.
Card Skin: Dark Knight
Trivia
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Kris, along with Ralsei, were given a card skin and Avatar the moment they were released. Lancer came a few hours later.