Ancient War Titan

Platforms. The ancient war titan has two platforms built into its chassis. One Medium or smaller creature can ride on each platform without squeezing. To make a melee attack against a target within 5 feet of the war titan, they must use spears or weapons with reach and the target must be Large or larger.

Siege Monster. The ancient war titan deals double damage to objects and structures.

Magic Resistance. The ancient war titan has advantage on saving throws against spells and other magical effects.

Legendary Resistance (3/Day). If the ancient war titan fails a saving throw, it can choose to succeed instead.

Multiattack. The ancient war titan makes one axehand attack and one hammerfist attack.

Tyranium Axehand. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 15 (2d8 + 6) slashing damage, plus 11 (2d10) magic damage.

Apocryphal Steel Hammerfist. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 11 (2d4 + 6) bludgeoning damage. If the target is a creature, it must succeed on a DC 15 Strength saving throw or be knocked prone.

The ancient war titan can take 3 legendary actions choosing from the options below. Only one legendary action can be taken at a time and only at the end of another creature's turn. The ancient war titan regains spent legendary actions at the start of its turn.

Teleport. The ancient war titan magically teleports up to 80 feet to an unoccupied space it can see.

Sweeping Axe. The ancient war titan makes a sweep with its axehand, and each creature within 10 feet of it must make a DC 15 Dexterity saving throw. A creature takes 5 (2d4) slashing damage on a failed save, or half as much damage on a successful one.

Stomp. The ancient war titan stomps it foot on the ground in front of it, each creature within 5 feet of it must make a DC15 Strength saving throw or be pushed 10 feet in a straight line away from it and knocked prone. On a successful save a creature isn't knocked prone.