I thought of a symbiote of my own if anyone wants to use it you can his name is apocalypse after his creation he was split into 4 weaker symbiotes their names are war, death,plague and famine
Each with there own abilities war can not only copy any fighting style but he can also absorb some of the strength of someone he touches death when he touches someone they start to rapidly age famine absorbs the nutrients of any one he touches and they shrivel up plague can make any disease and apocalypse can do all of those things