This is twice now in as many days that the wormsinger stalking party event has not given me a wormfeeder rune. It's frustrating, especially when my fireteam member who did NOT have a wormsinger rune to start with ended up getting one from the ogre that was spawned.
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Its all random !!! Just like Destiny is... here is what i did to avoid a RANDOM player from getting the wormsinger rune after beating the Ogre ! Before you do this, be in orbit ! Go in your PS4/XBOX setting, go to time and date. Swtich the year to 2014, go into the dreadnaught and do whatever it is you need to do. Make sure you are alone. (fireteam) No one will bother you, you will not have any randoms helping you beat the ogre. When your done, switch back to the actual year. NOTE, i use this method to farm Exotic engrams by killing Fallen champions, the fallen will not spawn if your in year 2014. Enjoy