Partly updated for Enshrouded 1.0— 1.0: the unlock cost; the rest is pre-1.0 wiki data

Crash Down Attack
When equipped with a Melee weapon, you can perform a jump attack during the descent of your jump. Crash Down deals 50% more weapon damage in a small blast radius and costs Stamina according to the weapon's weight. Cost: 35-60 Stamina Block Breaker This special attack fills a blocking enemy's Stun Bar twice as much when hit.
Where Crash Down Attack sits on the 1.0 tree
In the Warrior area. The cheapest way in from a starting point buys 5 nodes for 7 points, this one included (one rank each).
Related Warrior skills
Same archetype — likely candidates to slot next to Crash Down Attack in a build.
Absorb1pValues in the 1.0 files: 4% per rank, 3 ranks.
Constitution1pIncreases your Constitution attribute by 1 Increases Health by 50 per Attribute Point
Finesse1pValues in the 1.0 files: 15% per rank, 3 ranks.
Heavy Handed1pAn enemy's stun bar is increased by an additional 20% when attacking into their block with a melee weapon.
Heavy Plates1pValues in the 1.0 files: 4% per rank, 3 ranks.
Purification1pAfter defeating a Shroud infested foe with a melee weapon you replenish +5 seconds of Shroud Time. Shroud Time Should this time run out, the Shroud will consume you.
Shiny Plates1pValues in the 1.0 files: 4% per rank, 3 ranks.
Strength1pIncreases your Strength attribute by 1 Increases Melee damage by 5% per Attribute Point
Sources: game files 1.0 + Keen Games 1.0 patch notes (changelog, combat changes) for the unlock cost; enshrouded.wiki.gg (pre-1.0) for the description and effects.