Let us refocus on elabi adumbratum. It's development is the most obvious reasoning behind this draconis being given the designation venificus (magical/poisonous) rather than magus (magical). The species now uses what is best termed magic but it is a natural emination from the same glands that produces its defensive poison. Said poison is concentrated along the spine and is excreted along runnels in the large dorsal spikes. Once the liquid gains contact with the air it exhudes a rather spicy scent and a sense of contained power. Users of the lesser magics can only harness the power emanated or the poison itself (much as the original owner of the liquid would have). Users of the dark magics use the poison in much the same way as they would a sample of blood or other bodily fluid and the more powerful magi can use a sample from a dead leaf, dried and barely detectable, to influence their will upon an entire family group.