Steps
Decide which node to modify: locate its ID in ACP > Applications > Node Tree > {desired category}, check URL for the ID, see below:
In this example it's 47.
Open EXTRA.css in ACP > Appearance > Templates > {desired style} > EXTRA.css
Insert the following code:
.nodeList .node_47...
Add at very very bottom to EXTRA.css template of your style:
/* <----- start FONTS ------->*/
@font-face {
font-family: 'ecliptic';
src: url('./styles/default/xenforo/fonts/ecliptic.eot');
src: url('./styles/default/xenforo/fonts/ecliptic.ttf') format("truetype")...