Gadget-CovenantFont.css

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/* Set the wiki to use a Covenant font */

@font-face {
	size-adjust: 60%;
	font-family: 'Covenant';
	src: url(https://halo.wiki.gallery/images/Covenant.ttf);
}
body.ns-content.action-view * { font-family: 'Covenant' !important; }

MediaWiki:Gadget-CovenantFont.css