Bastion is the map you're thinking of. (Destiny)

by Xenos , Shores of Time, Friday, October 24, 2014, 09:37 (3470 days ago) @ Schedonnardus

I agree, with the crazy good tracking Truth is really good for longer shots on enemies (PvP or PvE) as the lock on takes effect on fire instead of on hit, so if the enemy vastly changes position you have a much better chance of getting a kill with it than with Gjallarhorn. With proximity explosion and a huge blast radius you also have a great chance of getting a kill at close range. For damage done of course, Gjallarhorn does MUCH more damage against big bads, so they each have their own strengths.