Cadbury Moose@isaackuo @Infoseepage @noelreports
It's quite possibly an "off the shelf" item, used for on-site welding - especially of railway track. Then you just need a container with a hole in the bottom for the igniter and a suitable heat-resistant lid to protect the drone as it pours molten steel onto the target.
(Someone was selling "NR Grade Thermite" on eBay UK a few years ago - I suspect the NR stood for "Network Rail".)
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