"Opulent Fiend", created using FontStruct, is a Donationware font.
For any use, commercial or non-commercial, you can either:
1. Donate any sum of money to Andrew McCluskey via PayPal: firstname.lastname@example.org
. While I recommend the donation sum is what you feel the font is worth to you and what you feel is right for what you're getting from the font, it can literally be any sum of money.
2. Or just let me know that you're using the font, via email to email@example.com
, with a tweet to @NALGames, or through DaFont directly! You don't need to attach any samples of the work, though if you can, it is highly appreciated, so thank-you. Just mentioning what you're using it for is preferred but not necessary.
Doing either of these things grants you, or the organisation/etc you represent, the ability to use this font infinitely for anything and everything you desire. I do not restrict what you want to use it for, anything goes.
You may redistribute this font, but please let me know via firstname.lastname@example.org
(I won't prohibit redistribution under any circumstance) and please include everything contained within the .zip folder the font was downloaded in. More...