Ancient Dragon

The Ancient Dragon is a Pre-Hardmode boss that can be fought after the Tiki Totem has been defeated. This boss is completely optional and is actually more like fighting a normal enemy.

Spawn
The Ancient Dragon will not spawn on its own. After the Tiki Totem has been defeated, Ruin Ghosts will spawn in the underground Ruins mini-biome and also spawn if there is a substantial amount of Clay Bricks in an area. Ruin Ghosts holding a lantern have a chance of dropping a Rusty Lantern, which can be used at a Ruin Altar to summon the Ancient Dragon.

Behavior
The Ancient Dragon burrows through blocks while trying to reach the player. When it reaches 50% of its' health, each body segment can shear off when hit, turning into a Baby Dragon.

Attacks

 * The Ancient Dragon charges towards the player.

Expert Mode

 * The Ancient Dragon can inflict the Stoned debuff for 4 seconds when damages the player.

Tips

 * Piercing weapons are highly effective, as damage on each body segment will be dealt to the Ancient Dragon's total HP.
 * Consider a Summon damage build, as your minions will still be active while you're petrified.
 * Unlike other worm-type enemies, the Ancient Dragon is knocked back when struck by player attacks, making the fight extremely simple if the player has any minions or weapons that attack quickly