Regigigas
normalRegigigas can be found at the Snowpoint Temple. To summon it you will first need a Titan Relic.
Locate Structure Command
/locate structure cobbleverse:snowpoint_templeHow to Obtain
You will need all of the other titans AND their reilcs before you can get Regigigas.
You will need a maximum of 3 each. One to summon the titan, one to craft the titan ore, and one to craft the radar. If you already found the Snowpoint Temple, then you will only need 2 of each since you will no longer need the radar.
Materials Checklist
Use the radar to locate Snowpoint Temple. Put this radar with an empty map in any regional cartography tables.
Using the radar, make your way to the temple. It can be found in Wintry Lowlands and will look something like this:
Before entering the temple, make sure that all 5 titans are in your party. Order doesn't matter here, just that all 5 are there:
Upon entering the temple, you will see a Regigigas Statue and a book on a lectern. Before doing anything, hang right. There is a hidden barrel with the following:
Use the Titan Relic on the Regigigas Altar. The hitbox may be awkward, try aiming between the legs.