One of the primary authors of Dungeon World 2, Primarch, has told me that I can share the Google Drive link wherever I please. So here is the Dungeon World 2 alpha playtest: https://drive.google.com/drive/folders/1Hp3f8laeI1bf-pRrwD9nXqkRxZAbB_PN

I find enemies' escalation mechanic very fascinating. In this game, whenever an enemy takes damage, they automatically escalate to a more dangerous phase and retaliate appropriately. Sometimes, the final phase is actually an attempt to retreat. For example, a dragon's escalation track looks like this:
>• Annoyed — Tear something to pieces
>• Proud — Take to the skies
>• Nervous — Conjure allies of living flame
>• Furious — Ignite everything in the scene
>• Afraid — Escape to enact future vengeance

A masked thief's is like this:
>• Endangered — Unleash dangerous poison
>• Cornered — Escape with shadows and smoke

An elven queen's is like this:
>• Angry — drown the invaders under the burgeoning green
>• Hurt — unleash the blight, consequences be damned
>• Hopeless — slow down forest time to a crawl

In certain cases, an escalation track weakens an enemy, such as a horde with diminishing numbers.