Gustavo Flint was seriously considering Amberser's suggestion.
Honestly, the customized "undead" by Amberser didn't pose much of a technical challenge, because what Amberser had customized was only the shell.
The real core of the matter was Amberser's Pseudo-Soul crafting technology, and the special ability to convert inorganic matter into corpse attribute.
Without these two cores, the only thing worth mentioning about the shells Gustavo Flint produced was the miniature jet engine.
But without a way to remotely control them, these jet engines were less useful than ordinary enchanted arrows.
It's a pity that alchemy has developed thus far, yet it still can't achieve low-cost, long-distance control.
