Had to use
<?php
$args = array( 'hide_empty=0',
'taxonomy' => 'molecules_of_the_month',
'childless' => 1,
'number' => 6,
'orderby' => 'ID',
'order' => 'ASC'
);
$the_query = new WP_Term_Query($args);
foreach($the_query->get_terms() as $term) :
// foreach( $molecules_of_the_month as $month ) : ?>
<!-- Post Content goes here -->
<li class="post-grid-post splide__slide">
<?php
$summaryimage = get_field('summary_preview_image', 'term_' .$term->term_id ); // field, id and format value
to make it work. Well, that seems to make most of what I want do. Need to limit description, tweak html to work on mobile. But will work well soon.
