Others have addressed the PVP aspect, so I will give some observations about the boss spawn rates. I have done all of the Cyrodiil delves on 3 different characters now. I have found that only a few are frustrating due to boss spawn rates - I think some caves have different rules. In many of the delves the bosses SHARE a 10-minute timer, so only one random boss spawns every ten minutes. But, there are also some delves where each boss is on a SEPARATE timer. So for example, in Lipsand Tarn I can kill Marbita then run to Gaston Ashham spawn location and have to wait 10 minutes to see if he spawns... if not then I have to run back and kill Marbita again. However, in Breakneck cave I can kill Longfang and then run to Hegris the Black Dagger and he will have already spawned without a wait.

1-boss delves are straight forward. 2-boss delves aren't bad if you know where the bosses spawn because you can camp the spawn spot and if the boss doesn't spawn in 10 minutes you HAVE to kill the other boss first... sometimes you will kill the same boss several time befores the one you need spawns. 3-boss delves can be tricky... the third boss can take a while if you're unlucky. You can't just wait for a boss to spawn, you should be killing a boss every 10 minutes. I use the Blessing of War timer to know when 10 minutes pass. I have listed some of my observations below.

Hard
Pothole - 3 bosses, random every 10 mins. I will camp where I can see both Serrin Vol and Diabolist Vethisa spawn locations. If neither of those spawn in 10 minutes, then I will go kill Blighttooth.
Bloodmayne - 3 bosses, random every 10 mins. Similar to Pothole, I will camp between Razorback and Ironlash and if neither spawn in 10 minutes, I will have to go kill Acanthia. I recently spent over 2 hours here and killed Acanthia 5 times in a row before Ironlash finally spawned.
Cracked Wood - 3 bosses, I think it is random every 10 mins, but its hard to tell with all the grinders constantly killing the bosses.
Toadstool - 5 bosses, good spawn rate, but 1 boss is a long run from the other 4, I think 2 bosses can spawn at a time. You can camp where you can keep an eye on the 4 bosses at the bottom, but if they don't spawn you will have to run back up to kill Dreadfang.
Newt - 2 bosses, random every 10 mins. This one is tough because it is filled with trolls so the run between the two bosses is tough (unless you're a nightblade).

Fair
Lipsand Tarn - 2 bosses, random every 10 mins
Red Ruby - 2 bosses, random every 10 mins
Quickwater - 2 bosses, random every 10 mins

Easy
Echo - single boss.
Capstone - single boss.
Kingscrest - single boss.
Vahtacen - single boss.
Muck Valley - 3 bosses, good spawn rate, I've never had a problem here.
Breakneck - 2 bosses, good spawn rate.
Serpent Hollow - 2 bosses, good spawn rate.
Haynote - 2 bosses, good spawn rate.
Nisin - 2 bosses, good spawn rate.
Underpall - 2 bosses, I can't remember the spawn rate, but I've never had a problem here.

Choose a very high population campaign, a population locked one, and all of the caves will be empty. Or choose a campaign that is completely dominated by your faction. It's really random chance if you run across a player inside a Cyrodiil delve. When I got my achievement, all of the caves except one were empty. I also grinded no multiple characters in Cyrodiil dungeons, probably spent over 15 hours in a few, and I did not run into any enemies.

The ganking scare is blown way out of proportion. 90% of the time you will be alone with nothing to worry about.

I'm in these delves a lot for the Blessing of War and also farming grand soul gems and the special blue gear the boss drops (sells pretty well in the guild store). I don't grind, though - I skip most of the mobs by using dark cloak as a nightblade and rapid maneuvers/sprint as any stamina build.

In addition to Cracked Wood Cave, I see higher grinding activity in Red Ruby, Quickwater, Lipsand Tarn, and Muck Valley. In general, I see more ganking in buff servers than in Azura's Star. My 3rd and most recent character did almost all of the delves while in Azura's Star and was never ganked. I only saw players from opposing factions a few times - I did the friendship dance each time (put away weapon, jump up and down a few times, wave, sit in chair, etc.) - I never had to fight. I PVP a lot, so I'm not scared of it, but if I'm in a cave I'm not there to fight or gank. I'm actually starting to think that buff servers are more dangerous for Cyrodiil PVE (not Imperial City) than Azura's Star.

I did this recently on a high population server. Honestly through the whole achievement (that is, every delve, boss, dolmen and skyshard in cyrodiil) i only was ganked a handful of times. I even did these at peak hours most days.

Truth be told most high traffic campaigns seem to be full of.... you guessed it... PVPers. And most of the time they will want to be where the PVP is... So they won't bother doing a delve, and if they do its a quick solo in and out to get an AP boost.

I had very little trouble with this. That isn't to say you wont die, you probably will once or twice, just pick up your pants and head back. If they're still there, you can always try another delve, or even another campaign

DMuehlhausen wrote: »

NewBlacksmurf wrote: »

Metamon wrote: »

@daemonios

Low population is a good idea, but pretty much all servers show one bar for each faction XD

@NewBlacksmurf

I don't mind dying or waiting for spawns too much, but yeah- a PVE Cyrodiil for people that almost never touch PVP would be very nice indeed. The only downside I see is Zergs will no longer have free targets that are the PVE players

That isn't a downside.
It bothers me that ppl feel it's a good thing.

It's also very sad that ppl seek to hunt non-hostile players. It's like ZOS has a mental disease to encourage this behavior. It's sickening

That isn't ZOS that is how it is in every game. You give the PvPers a zone for them but it has PvE achievements players are going to go after the weak.

True...but dang...can ZOS take a hint?
Or is ganking that cool?

Metamon wrote: »

I just now realized to get this I need to do the caves in Cyrodiil ;-;
I've been doing everything else Solo just for this one title (Explorer), since it actually feels earned compared to simple story or guild titles
I would try the Cyrodiil caves if I didn't get ganked before even getting close to them XD
After two more Caves in Malabal Tor, I just have Reapers March and then... Cyrodiil...

For those with the achievement and no friends, who also lives in Australia (to understand my pain)- what should I do?
Pray that there are other players heading there when I am or just keep at it until I knock them off one by one hoping my Alliance 'locks down' a region when needed?

On another note, Reapers March is all I need to do for my Tamriel Trailblazer achievement too- so that's something for me to look forward to I guess XD

You're also Australian, use that to your advantage. Whether you play EU or US you can play at what I call the 'goofy' hours, which means you can be in Cyrodiil when the place is low population. Expect getting player killed, but I've soloed Cyrodiil dungeons so many times, and I can tell you its easy. Most of my characters have this achievement. I'll tell you though that I happen to like Cyrodiil, and the main reason I've dipped in those caves was for a 'different kind of pvp'. Even so, I can tell you that its still good times for you. You might also want to grab scouting missions while you're at it. You can scout something out and get a few alliance points for going where you plan to go anyway. There are four skyshards as well which are hard to acquire (Forget that, its impossible now) unless your campaign is dominating the map. Those are the skyshards behind enemy gates, near the starter areas. Beyond that its fairly easy for anyone to pick up. Nightblades do it the easiest with stealth and cloak, but if you get yourself some invisible potions and the right gear you can speed sneak your way around the map easily if necessary. I've helped plenty other people accomplish this goal as well.