Project Long Shadow
Head to the Research Post Long Shadow and investigate the facility. There are two consumable DNAs here so you can wreck some havoc then consume them, escape the alert then return to infiltrate the facility.
Once inside, you have to defeat the hydra. There are explosive containers scattered as well as rocket launchers so use these to your advantage. Heal yourself by consuming the soldiers nearby then continue attacking the hydra until its defeated.
You'll acquire the tendrils ability after defeating the hydra. Test it on the unfortunate troopers who entered the area. After clearing them out, fight your way out of the facility. Escape the alert to complete the mission.
After this mission, two missions will be available, as well as another Blacknet operation. (Operation: Manticore)