From free-roaming to challenges, there's always something to test your skills within Lost Ark. In the end you'll have to fight world bosses, who are formidable creatures that appear in certain areas of the map.
World bosses are generally more powerful than normal monsters, and they might not always be in the area. If a world boss dies it will take about 30 minutes for it to respawn. If you are unable to locate a world boss within the spawn area that is designated to it then you might need to return later or wait to be the first to knock it down after it respawns.
What is the location of Rudric situated in Lost Ark?
Players will find Rudric in the graveyard within the Rethramis Border. Particularly, you'll want to look at the southwest part of the cemetery.