From Destinypedia, the Destiny wiki
The Oracle Engine
Arc Slug Rifle
Summon Taken Summon Hive High Durability Rapid Movement Shield Bash Shield Lunge Teleportation Shield Blast
Val Pros, Tower Sentry was a Taken Phalanx tasked with guarding the Oracle Engine. There, Pros will run into The Guardian and finally meet their demise by their hands.