Poison is one of those things that really isn’t much fun. This gets pretty obvious in real life when you look at critters with poison. Now, sometime, you get something large with poison, like trees, but as a rule, poison only happens in small critters. You look at a rat, it is mean, it’ll 'ave a go, a lemming doubly so, but all it’ll do is take off some skin… Then you look at a spider, likes to hide, can kill something a thousand times its size… Or a snake, likes to go to sleep on paths, tends to be nigh-invisible or easily mistaken for a stick, reacts to being imperilled(such as when someone walks along the same path it is sunbathing upon) by killing something a hundred times its size… Poison has this annoying habit of multiplying the tediousness of survival. You can safely ignore twenty rats wearing bandannas and carrying needles who glare at you and draw their free paws across their necks in perfect unison, but one dark shape moving in a dark shadow can end you…