Gadget-PrometheanFont.css

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/* Set the wiki to use a Forerunner Promethean font */

@font-face {
	font-family: 'Forerunner Promethean';
	src: url(https://halo.wiki.gallery/images/Forerunner_Promethean.otf);
}
body.ns-content.action-view * { font-family: 'Forerunner Promethean' !important; }

MediaWiki:Gadget-PrometheanFont.css