Decanus Severus

Decanus Severus is found in Cottonwood Cove. He is part of a free form quest in which the player may trade NCR Dog Tags to him for ammunition or victuals (after passing a Barter check of 35 with Aurelius of Phoenix who pays 10 caps per tag if the check is not passed).

Trade Items
Weapons:

25 Dog Tags -> 9mm Submachine Gun

Armor:

20 Dog Tags -> Leather Armor

25 Dog Tags -> Leather Armor, Reinforced

Explosives:

3 Dog Tags -> Frag Grenade

3 Dog Tags -> Dynamite

[Ammo and Food Supplies are of more negligible value, though for great Caesar's Legion Fame, trade with Aurelius alone.]

Bugs

 * If you working with the NCR with the quest For the Republic, Part 2 and you gain infamy from Caesar's Legion after finshing the Omerta's quest, returning to Decanus Severus to gain fame using the infinite fame glitch, if you are still Vilified by them even if your Pip-boy shows that you are Idolized to them. This bug can appear if you work with Yes Man & Mr. House (needs testing)
 * This test was performed with Legion Veteran Armor beacause you can't talk with Decanus of being Vilified by them. From this point Caesar(read his page) will start having a bug. Reaching his tent and trying to talk with him, no text will appear even the dialog box is present, immediately he will raise up from his chair, and will start become hostile to the Courier, with all the members from the Legion in that tent. So, no more mission from this point, can be made for Caesar's Legion.

Infinite experience and fame glitch
There is a glitch even in patched version which allows player to get infinite experience and Legion fame. In dialog choose the following: Reward: +50 exp and Legion fame. Could be repeated infinitely.
 * I have some questions.
 * Do you see much action against the NCR?
 * That's all for now.
 * I can show you how to disarm NCR's mines.
 * [Explosives 50] The trick is to rush the mine and press the blinking red light.

Still works as of 12.18.10.

Behind the scenes
In Latin, decanus refers to a military rank of "a commander of ten soldiers", while 'severus' is translated as 'stern' or 'severe'.

Appearances
appears in Fallout: New Vegas.