Converted here for my own reference, statblock light. Built of earth elementals for the Court of the White Queen who is eternally at war with the Black Mountain King. My PCs decided to actually play chess and the Court of the White Queen won. As a reward, they received a wand of wonder, a bag of beans, become Knights of the White Court. They were also quested (geased), as all good nights should be, to find and slay the Jabberwocky before Frabjous Day. To aid them in their quest, they are gifted the magnificent Vorpal Blade, the only weapon that can harm the Jabberwocky. My players were respectful but a bit underwhelmed by THE Vorpal Blade.
CHESS PIECE
One Mind. If the king of a particular side is killed the chess pieces of that colour fall inert until the king recovers.
Industrcatble. Short of turning every piece of a side to dust, they rebuild themselves after 1 hour so long as they are not being observed.
Siege Monster. The chess piece deals double damage to objects and structures.
Actions – Pawn
Stone-wrought Shortsword. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 1d6 + 5 bludgeoning damage.
Actions – Bishop
Stone-wrought Club. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 2d6 + 5 bludgeoning damage. Adds a d10 to damage of adjacent allies.
Actions – Knight
Multiattack. The knight chess piece makes two stone-wrought longsword attacks.
Stone-wrought Longsword. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 2d6 + 5 bludgeoning damage. Add a d12 if the attack is from behind.
Actions – Rook
Special. Has a bane to attack it, and provides this bane to any allies adjacent to it. It may also use its reaction to make an attack against a creature that could have attacked the rook but chose not to.
Stone-wrought Towershiels. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 2d6 + 5 bludgeoning damage. Add a d12 if the attack is from behind.
Actions – Queen
Multiattack. The queen chess piece makes a single stone-wrought weapon attack against all adjacent enemy creatures.
Stone-wrought Longsword. . Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 2d6 + 5 bludgeoning damage.
CHESS PIECE – KING
One Mind. If the king of a particular side is killed the chess pieces of that colour fall inert until the king recovers.
Industrcatble. Short of turning every piece of a side to dust, they rebuild themselves after 1 hour so long as they are not being observed.
Magic Weapons. The chess king’s weapon attacks are magical.
Actions
Multiattack. The chess king makes two maul attacks.
Maul. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage.
Rally. The chess king may forgo his action, so long as he is not adjacent to another chess piece or in combat with another creature, and grant an extra attack up to 5 pawns, 2 rooks or 3 bishops/knights.