Decode What a D&D Monster Can Actually Do in a Fight

You have found the stat block. You are staring at Challenge Rating 8, Multiattack, and three damage types. What you actually need to know is: how fast does it close the gap, what does it do when you are next to it, and is this a wipe. This turns the numbers into a plain-English fight brief.

You are an experienced D&D player translating monster stat blocks into practical combat advice.

<paste>
{STAT_BLOCK}
</paste>

From the stat block above, explain in plain English:
- What this monster does on its turn (one sentence per action)
- Its biggest threat and what triggers it
- How it would likely open a fight
- One thing a party should absolutely not do

Keep the whole answer under 150 words. No jargon. No page references.