What section was it in?

Under the "Modern History" subheading for Ossus.

Then that'd be me.

If you want to know where the Tholme reference came from......

Legends had two battles take place on Ossus during the Clone Wars. Links to each battle can be found here:

http://starwars.wikia.com/wiki/First_battle_of_Ossus
http://starwars.wikia.com/wiki/Second_battle_of_Ossus

Note that the Atlas references both (the Atlas is literally one of my favorite Star Wars reference products of all time).

So, Ossus is generally thought of as mythical, lost, etc. It wouldn't make sense if it was a well-known location during the Clone Wars, on most star charts, etc, only to be considered a myth a few decades later. I feel like with all the star chart resources out there, it'd get found out pretty fast. So clearly (to me) it was a location closely guarded by the Jedi, and known to Dooku (remember he erased the location of Kamino in the archives, he might have learned of Ossus then). I figured Ossus must have been a planet cordoned off by the Jedi for specific research and exploration, but too dangerous to be left open to all Jedi, or the public.

So now I've decided that the location of Ossus is going to be a Jedi secret. This immediately puts it in the domain of Jedi Master Tholme, for me. Dooku allegedly took Ossus early in the Clone Wars. Presumably to search for artifacts related to his Dark Reaper super-ish-weapon from the Clone Wars video game the reference originates from. Dooku likely arrived and steamrolled over what few Jedi librarians and researchers were nearby, and whatever elite ARC troopers were sent to assist them.

Tholme was in charge of Jedi Intelligence during the Clone Wars, and the sort of small-scale, secret war counterstrike launched two years later would fall under his Nick Fury-like domain. Unfortunately, I hadn't read Dark Disciple at the time (or it wasn't out, more likely). In that canon novel, Vos recounts how Tholme died early in the Clone Wars in a battle with Dooku and Ventress. Early certainly wouldn't be at the tail end of the conflict, during the opening salvos of the Outer Rim Sieges. This presents a conflict.

Of course, I couch the idea of Tholme's involvement, and the battles themselves, as conspiracy theories allegedly leaked by a lone surviving ARC trooper. They don't have to be true. And if you're willing to believe they are true, then the idea of Tholme faking his own death for superspy/intelligence purposes (without vos ever finding out his master survived), isn't quite so far fetched. Nick Fury did it in Winter Soldier, after all.

Of course, I couch the idea of Tholme's involvement, and the battles themselves, as conspiracy theories allegedly leaked by a lone surviving ARC trooper. They don't have to be true. And if you're willing to believe they are true, then the idea of Tholme faking his own death for superspy/intelligence purposes (without vos ever finding out his master survived), isn't quite so far fetched. Nick Fury did it in Winter Soldier, after all.

If I remember correctly, his fate in Legends had a similar flavor. I definitely recall reading Dark Disciple and expecting him to show up at some point.

Besides, even if he really did get killed early in the war, it's still possible that he left instructions and plans behind about Ossus for his successor to pick up. The Jedi might have carried it out, and the ARC trooper is either misremembering or deliberately spreading false information about the operation. It's not as clean an explanation as "Tholme faked his own death," but it works.

Apologies if this has been raised elsewhere but I couldn't find it. It seems the Temple Guardians have Agility 2, but the Temple Guardian Lightsaber Pike is Unweildy 3. This seems... odd? silly? a mistake?

Apologies if this has been raised elsewhere but I couldn't find it. It seems the Temple Guardians have Agility 2, but the Temple Guardian Lightsaber Pike is Unweildy 3. This seems... odd? silly? a mistake?

Probably occurred due to the material being in two separate books, with the possibility that whoever wrote the Temple Guardian stat block was unaware that the saber pike had Unwieldy 3. And since they're separate books, it'd be easy in the editing process to miss that detail.

It's an easy enough patch to simply bump the Temple Guardian stat block to have Agility 3, since that won't really affect their dice pool for Lightsaber combat checks.