Aside from the Elite Zealots and the Elite Field Marshall, which only appear in very specific parts of the Campaign, the Elite Bobs are the most vicious enemies one can encounter both in the Campaign and in Firefight.
On Heroic or Legendary difficulties (or on any difficulty with the Mythic skull turned on), Bobs can survive the explosion of a Plasma Grenade stuck to their heads or a direct hit from a Rocket Launcher or two direct hits from a Fuel Rod Gun.
It's okay that this is quite identical to the Ultra-description FOR NOW, but this must be obliviously adjusted (the aren't very vicious since they might totally ignore you). I supoose this was just to remind Pulse to add BOBs to the list?
Anyway, for feedback: The guide layout looks nice. I hope we can change the size of the preview images of the enemies (to something like twice the size of the "SGP Guide" image), so it can be seen better...Or if we were to take the "click to make huge" approach, we could add a text indicating that possibility.
The weakness of the current Weapons Table is that it is not as easy to adjust as the earlier was, but it looks so much better I say we keep it. 
Aside from the guide, I say we still MUST decide the case with the Blue: if it's not the sidebar (It seems I've started to dislike the idea now) the it must be Something (other than the links, that's too small). Perhaps we could change the "h1" class to blue instead of green? I think it might even be good for the text itself, it could be more easily tell it apart from the header.
I'm working on writing about the Elites. I was actually going to start my research on Zealots when I check the SGP for unread messages.
I've changed the content, ie, the "How to deal with" only appears on the Species section, not the individual Ranks.
Here's what I've got for now:
Elites:
The Elites are "the dominant military muscle for the entire Covenant structure"[1], being the ultimate enemy on the Halo: Reach Campaign and Firefight mode.
Wielding a wide variety of weapons, including their signature weapon, the Energy Sword, Elites are usually seen leading groups of lower ranked Covenanters, Elites or otherwise, and employ advanced combat tactics which, coupled with very strong Energy Shielding, mark the Elites as formidably strong foes.
Dealing with Elites:
The easiest and most efficient way to kill an Elite is to fire non-charged bolts from a Plasma Pistol or another Directed Energy weapon such as the Plasma Rifle or the Plasma Repeater until the Elite's shields are depleted and then to finish it with a headshot-capable weapon.
Alternatively, on lower difficulties, one can shoot an overcharged Plasma Pistol bolt instead of shooting several regular bolts.
Using non-Directed Energy weapons to deplete an Elite's shields on higher difficulties is considered bad practice and a waste of ammo.
Elite Field Marshall:
Field Marshalls are the highest-ranked Elite warriors in the Covenant army and only one is seen in the Halo: Reach Campaign.
The Elite Field Marshall is found on the final part of the "The Pillar of Autumn" Campaign mission and is the strongest enemy on the Halo: Reach Campaign.
Elite Field Marshalls do not appear on the Firefight mode.
Elite Zealots:
Elite Ultra:
Aside from the Elite Field Marshall and the Elite Zealots, which only appear in very specific parts of the Campaign, Elite Ultras are the most vicious enemies one can encounter due both to their shields' strength and combat skill, which involves nerve-wrecking strafing while shooting and very quick trigger fingers.
The shields of the Elite Ultras allow them to survive the explosion of a Plasma Grenade stuck to their head on any difficulty or multiple headshots from a Sniper Rifle.
___________________________________________________________________
[1] http://halo.xbox.com/en-us/intel/theuniverse/characters/text/sangheili/215feec6-8bc4-4832-8774-9f48ec515f56
Images will stay at 180x180px and will be linked to the full-resolution, 1920x1080px source image (check the RAR I posted somewhere above - it's working!). They will NOT get bigger - sorry.
The text will also not become blue because text must be black. And you can perfectly differentiate the text from the header because the header is a giant green rectangle and the text is... well... text.
That's a whole different topic, though - it's very easy to change colors. This thread is about this guide's content.
EDIT: The text I wrote is obviously a WIP - for example, I've just noticed I didn't mention in the Field Marshalls that they can survive a sticky grenade.
