I copied the function from /genesis/lib/structure/archive.php, renamed the function, then changed the class from "archive-title" to "title"

functions.php

<?php

/**
 * Add custom headline and / or description to category / tag / taxonomy archive pages.
 *
 * If the page is not a category, tag or taxonomy term archive, or we're not on the first page, or there's no term, or
 * no term meta set, then nothing extra is displayed.
 *
 * If there's a title to display, it is marked up as a level 1 heading.
 *
 * If there's a description to display, it runs through `wpautop()` before being added to a div.
 *
 * @since 1.3.0
 *
 * @global WP_Query $wp_query Query object.
 *
 * @return null Return early if not the correct archive page, not page one, or no term meta is set.
 */
function be_taxonomy_title_description() {

	global $wp_query;

	if ( ! is_category() && ! is_tag() && ! is_tax() )
		return;

	if ( get_query_var( 'paged' ) >= 2 )
		return;

	$term = is_tax() ? get_term_by( 'slug', get_query_var( 'term' ), get_query_var( 'taxonomy' ) ) : $wp_query->get_queried_object();

	if ( ! $term || ! isset( $term->meta ) )
		return;

	$headline = $intro_text = '';

	if ( $term->meta['headline'] )
		$headline = sprintf( '<h1 class="title">%s</h1>', strip_tags( $term->meta['headline'] ) );
	if ( $term->meta['intro_text'] )
		$intro_text = apply_filters( 'genesis_term_intro_text_output', $term->meta['intro_text'] );

	if ( $headline || $intro_text )
		printf( '<div class="archive-description taxonomy-description">%s</div>', $headline . $intro_text );

}
add_action( 'genesis_before_loop', 'be_taxonomy_title_description', 15 );
remove_action( 'genesis_before_loop', 'genesis_do_taxonomy_title_description', 15 );