Contending Cascade is an origin trait in Destiny 2 that can appear on 2 weapons. An enhanced version exists on crafted and some newer weapons.
What Contending Cascade does
This weapon gains bonus handling and reload speed based on your longest chain of rapid final blows from any source. After achieving an impressive record, final blows with this weapon create an elemental damage explosion.
Enhanced version
This weapon gains bonus handling and reload speed based on your longest chain of rapid final blows from any source. After achieving a less impressive record, final blows with this weapon create an elemental damage explosion.