I probably messed up trying to solo one, but it was my first time heading trying out any of these. But I went out to Colkhab and the fight itself wasn't that bad. I was on Blu and everytime trusts would die I would resummon. My accuracy was indeed a major problem but, after about an hour or so of soloing it around 15-20% down 3 people arrived with their hordes of trusts and Colkhab eventually died around 15 or so minutes after that.
Going off the drop list I didn't think I'd have nearly as hard time hitting it as I did, nor did I think it would have as much health as it did. Are these Events still focused more on small grouping?