If I were to run this today, it would be in Torchbearer. Torchbearer uses a test against Health to test reflexes - so it would probably be an Ob 2 Health test to avoid poisonous insects, or an Ob 3 Health test to avoid a striking snake.The situation is there are some ceramic lidded jars containing gold pieces and poisonous live insects or reptiles. How would you run this? I'm thinking of it as more of a trap than a combat but am open to ideas anyone has. Thanks!
If one takes Health 4 as typical, that is a (roughly) 2/3 or 1/3 chance of success.
In 5e D&D this is presumably a DEX save - taking +2 as typical, that suggests a DC of 10 against insects or 15 against the striking snake. Failure exposes the character to the poison.