Von leon equipments

I don't really think it's worth the effort because that set would restrict you quite a bit and the effects aren't all that great. You just have to finish the theme dungeon and get the item for entry along the way as normal.

Set reference:

 Spoiler

4 equipment from this set would give the following benefits:
Weapon Def.: +100
Magic Def.: +100
Accuracy: +100
Avoidability: +100
All Stats: +4
5 equipment from this set would give the following benefits:
Weapon Attack +10
Magic Attack +10
Weapon Def. +150
Magic Def. +150
Speed +10
Jump +15
All Stats +6
6 equipment from this set would give the following benefits:
Weapon Def. +200
Magic Def. +200
All Stats +10
STR +4
DEX +4
MaxHP +10%
MaxMP +10%
Ignore enemy's defense by 30%
5% chance to hit the enemy with a Level 3 Freeze