Classic
Expert
Master
- Spawns on the first night of the first day.
The Old Man in front of the dungeon.
The Old Man is an NPC found outside every dungeon. He guards the dungeons and a dungeon cannot be fully explored until he is gone. When spoken to at day, He will say "Come back at night if you wish to enter". When spoken to at night, he will turn into the Skeletron boss.
WARNING: At night, as soon as you click Old Man, Skeletron will appear with no confirmation message!
If you decide to enter a dungeon without fighting him during the night, a group of Skeletron Heads will spawn and attack you.
If you decide to go into a dungeon without fighting him during the day, a single Skeletron Head will spawn and hit you for 9999 damage. This makes it impossible to continue in the dungeon during daytime. Tunneling into the dungeon from underground will have the same result.
As with the Guide, the Old Man can only be hurt with lava. He will only take 1 damage per second from the lava. Killing the old man is pointless, because his death does not eliminate the Skeletron Heads that will appear inside the dungeon and you will not be able to fight the him until the next night when he respawns.