A crystal tear formed slowly over the ages where the Erdtree's bounty falls to the ground.
Can be mixed in the Flask of Wondrous Physick.
The resulting concoction makes consecutive attacks grow stronger the longer they continue. However, the effect lasts only for a short time.
Grants a damage bonus upon attaining a certain amount of "points" from landing melee weapon attacks and certain spells: gaining 17/30/45/60 points increases Attack Power by 9%/13%/20%/20%. 1 point is lost every 0.5/1/0.7/0.4 seconds that has passed since a point has been gained.
In general, light attacks increase the tier for every 3 hits landed while heavy attacks increase the tier for every 1.5 hits landed (rounded up).
Notes
Point gain from melee weapon attacks is largely independent of weapon class: most weapons gain 8 points per light attack of any kind (including dual wield attacks), 10 points per heavy attack or jumping heavy attack, and 14 points per charged heavy attack or guard counter.
Multi-hit attacks gain points every time they hit: as an example, the two-handed light attacks of Claws hit twice and such give 6+6=12 points if both hits land.
Some exceptions: Fire Knight's Greatsword and Godslayer's Greatsword gain 14 points per light attack, the Ruins Greatsword gain 20 points per charged heavy attack, Claws of Night and Smithscript Cirque gain 0 points per heavy attack of any kind, any Fists weapon gain 8 points per two-handed light attack (16 points in total, since it hits twice) if the deal Strike damage, and Great Spears gain only 6 points for each of the first two hits of running heavy attacks and 10 for the final hit.
Ancient Dragons' Lightning Strike (melee range hit only) gains 20 points, Aspects of the Crucible: Tail gains 16 points for the first hit and 18 points for the second hit, Aspects of the Crucible: Horns gains 16 points (18 points if charged), Bayle's Flame Lightning (melee hit only) gains 16 points, Black Blade (melee hit only) gains 18 points, Dragonclaw gains 16 points, Dragonmaw gains 20 points, Fortissax's Lightning Spear (melee range hit only) gains 20 points (40 if both hit, Furious Blade of Ansbach (melee range hit only) gains 8 points per hit, Lansseax's Glaive (melee hit only) gains 20 points, and Scarlet Aeonia (initial landing only) gains 2 points.