the creation of ascending hot airflow and descending cold airflow.

the activated dispenser, with the inside of the magma block, will create an ascending hot airflow (visualization: particles of leaves), repelling the player flying on the elytra, from the dispenser to 15 blocks.

an activated dispenser, with a blue ice block inside it, will create a descending cold airflow (visualization: particles of snowflakes), attracting a player flying on the elytra to the dispenser from a distance of 15 blocks.