TAMING DOES NOT WORK. These creatures are non-tamable and if you look at the more section here on dododex it says it isn't tamable. Those people who are saying they are tameable are wrong. Up this so newbies and seasoned players alike don't waste time on false rumors.
When in the Old Railway Cave a.k.a the cave with the artifact of the depths DONT I repeat DONT bring a light pet it will make the seekers agro and try to kill you bring glow sticks instead they actually work.Make this popular so others don’t make the same mistake I did
Tried this "taming" method on official servers and on singleplayer both. Did not work. Used 12 bulbdogs on one, on the other 11 bulbdogs and 10 shinehorns. I had a trap for the seekers with a 1x1 box border around it, lightpets pressed against the wall. I even threw 50 glowsticks in the box with the seekers. No tame. I demoed the middle walls to see if they were blocking the light, and still no taming. Reckon the comments saying you can are just messing with you to waste your time. Or they are on unofficial/modded servers.
When you bring your little lantern pet, or anything that gives off charge, into the area of a seeker, the seeker will double in damage and speed and will aggro towards you until the source of charge has depleted. Oh and they spawn in big numbers, so run for your life.