Ace of Spades stemmed from Minecraft introducing Team Fortress 2 gameplay mechanics into the destructable world of Minecraft.
King Arthur's Gold is a game made by Soldat's creator Michal Marcinkowski and stems from Terraria introducing medieval-like gameplay mechanics where the primary objective of the game is to capture the enemy team's flag. In a way, the game still stemmed from Minecraft since Terraria had stemmed from Minecraft itself :P
There are 3 classes in the game which are Builder, Knight, and Archer. Builders mainly build and have low defence and attack. Knights fight with a sword, defend with a shield, and are able to throw bombs. Archers are able to climb trees and are the only ranged class in the game.
The game is in Alpha and is currently free. A premium version is also available for a 60% from the original $25 and is now ($9.99). The free version gives you all the basic features and the ability to play creative, against bots, and multiplayer. The premium version has more customization, more game-modes, more seige weapons, a zombies mode, items, fire and demolition, day-night cycles, access to premium servers, SNES mode, and access to a special part of the KAG forums.
Although the premium version sounds pretty awesome, the free version is still pretty good and you should all try it out!
Download the game here: http://kag2d.com/