None.
I think this was mentioned some time ago in earlier threads/posts, you CAN'T, I repeat, CAN'T change the terrain with an Extended Unit Death Trigger. 

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Oh_Man -- https://www.tomshardware.com/tech-industry/artificial-intelligence/openais-gpt-6-astra-model-autonomously-completes-portal-in-24-hours-feat-cost-just-usd571-in-tokens
NudeRaider -- one thing I find fascinating is how sure many people are AI is not "real" intelligence. "It's just a probability machine". Well yes, but who told you your brain isn't?
Oh_Man,
IskatuMesk