Helm/Armor/Gauntlets/Leggings-Apparel of Leeroy, Paladin of the Catacombs.
Long ago, the Way of White produced its first Undead, a paladin in golden armor. With the legendary treasures Grant and Sanctus, Leeroy set out Lordran, Land of the Gods, in the first Undead mission of the Way of White.
Location: Tomb of Giants. You must have killed Leeroy the Paladin's phantom on your way to Nito's lair. After you have done this, defeat Nito, and you will find a corpse where you dropped down to fight the boss containing this armor.
Notes: You must be in human form for Leeroy's Phantom to invade your realm and must be done before you defeat Nito.it is possible to get this set without defeating Nito. You can enter Nito's lair by sitting in the coffin in the Catacombs after killing Leeroy but before you face Nito. You will still find the set here.
You do NOT have to defeat Nito to obtain this armor set. Another way is after defeating Paladin Leeroy, simply go as if you were to join the Gravelord Covenant by nestling in the coffin in the catacombs. Nito will bring you to the Tomb of Giants and you can obtain the armor set there. You do not need to join the Gravelord Covenant.
Glitch?: There may be a possible glitch or some other occurrence that needs to take place for the Paladin Armour to drop. I've beat Nito 3 times, and every time I was in human form and had Leeroy invade. All 3 times I beat Leeroy and then Nito without dying and the armour set was no where to be found, even after returning to the boss bonfire. This happened pre- and post-patch 1.05. Possibly need to summon Leeroy for Pinwheel?? - (Defeat Leeroy and Nito. Leave the area and warp back. The armor will be there - Dekar88) - (did you quit the game after killing Leeroy? I've never summoned him for Pinwheel and have gotten the armor a number of times, but many of those kinds of events need the game to be quit and reloaded between parts for whatever reason - skytt)
Another way to get the armor; defeat Leeroy and Nito. Warp from the bonfire in the boss room (after defeating Nito of course). Homeward bound it back...Armor would be on the corpse. (needs confirmation - confirmed) I had the same problem that the gear would't drop. After trying this trick i found it, so confirmed. (I got the armor by doing this: kill Paladin Leeroy, fight Nito, go to the area where you find the armor during the fight, grab it, and use homeward bone.)
Upgraded with Twinkling Titanite.

Icon
Armor
Durability
Weight
Phys. Defense
Normal/Strike/Slash/Pierce
Elem. Defense
Magic/Fire/Lightning
Resistance
Poise/Bleed/Poison/Curse
Paladin Set.jpg
paladin_helm.png
Paladin Helm
Paladin Helm +5
500
500
5.0
5.0
22/20.9/25.3/22
34.1/32.4/39.2/34.1
12/13/7
18.6/20.2/10.8
8/13/9/22
8/16.5/11.4/27.9

paladin_armor.png
Paladin Armor
Paladin Armor +5
500
500
12.9
12.9
59/56.1/67.9/59
91.5/86.9/105.2/91.5
31/37/19
48.1/57.4/29.5
20/34/24/57
20/43.2/30.5/72.4

paladin_gauntlets.png
Paladin Gauntlets
Paladin Gauntlets +5
500
500
7.6
7.6
35/33.3/40.3/35
54.3/51.5/62.4/54.3
19/21/12
29.5/32.6/18.6
12/21/13/34
12/26.7/16.5/43.2

paladin_leggings.png
Paladin Leggings
Paladin Leggings +5
500
500
7.6
7.6
35/33.3/40.3/35
54.3/51.5/62.4/54.3
19/21/12
29.5/32.6/18.6
12/21/13/34
12/26.7/16.5/43.2


Totals
Totals +5

33.1
33.1
151/143.6/173.8/151
234.2/222.3/269.2/234.2
81/92/50
125.7/142.8/77.5
52/89/59/147
52/113.1/74.9/186.7