Updating my post about looking for campaign advice
Feel free to read the background below, you'll see I took many of your suggestions (had to simplify some for my beginner level GM thought processes) but this is the current status: The adventuring group has gone ahead through a time portal about 100 years with the help of the time staff. The time period they are in is a grim setting, Moander has huge influence and power there although details are light on that right now. Once there they learned that the Paladin's grandfather has likely been kidnapped by the Revenant Occupation from the custody of the Temporal Authority (time cops). The Revenant Occupation (RO) is a group of dwarves & elves who want to purify their race, part of it is they put forth they want to eliminate time travel. The players don't know though that they actually just want time travel for themselves and that is why they kidnapped the grandfather, the idea being to sacrifice him to try to access this magic in a ritual. They believe they know where the grandfather is but have heard that he is safe temporarily. The group became extremely suspicious of the time cops (I wasn't expecting that), so they are working on infiltrating them by becoming recruits and getting more information. They've also realized they don't have much money so they took up an offer to battle in an arena against psychic, mutant, dinos. I'm planning to have them hopefully win some gold and a dino egg as a prize and see where they go with that. (I unconsciously realized I got this idea from dungeon crawler carl) My thought is that as they infiltrate the time cops they will find spies there from the RO and could get more info on the grandfather and time travel in general. They will also learn about how I'm framing time travel in this campaign, I might have gotten this idea here, more that time travel creates different universes so you can't go back in time and change things. I'm afraid of keeping track of things if stuff gets too bonkers with that. They'll learn this in the training process as recruits.