This is another recent one for [link]

Here's the description: Combat Action: Spew Boulder (Brown Dragon)

Action Description:
Although the brown dragon has no natural breath weapon, it is capable of
using its own body to create a powerful ranged attack. By tearing off and
eating the pieces of stone, trees, or packed earth accumulated onto its
thick frame, brown dragons can shape a boulder-like projectile and spit it
at an opponent. Awakened dragons are even capable of coating the boulder in
a thick tar regurgitated from its belly. This attack has been affectionately
called, "Yummy Rock Surprise".

Spec Description:
In an arid desert, a female brown dragon of Elder Serpent age battles a male
silver dragon of Elder Serpent age. The silver dragon zips around in the air
above, frustrating the brown dragon who gives chase on the sandy earth.
Fed-up, the brown dragon stops and spews a tar-covered boulder of limestone
towards the silver dragon. The boulder hits with the impact of a canon-shot
and sprays sticky tar all over the silver dragon's fur and limbs.