Help Us Move People So They Don't Die to a Homunculus-Beholder

If not a conventional poison, maybe giving it indigestion would be a thought. Something designed to either disrupt it once consumed, or slow it down.

Also, negatives work well in nature - many things have colors, smells, etc. to warn away potential eaters. Heimdall, do you think we could steer Icarus away from targets, or in a general direction, using things it would find distasteful?