Here is a video of some methods to solo Crota. Since the Gjallarhorn is usually the cornerstone to this, I decided to show variations of weapons and classes that can take Crota down. As well as the strategies I use through out the Crota encounter. Hopefully you enjoy and this is helpful to some out there!
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I usually use Dragon's Breath with solar flare, if i hit him dead on he will walk back but still be able to be damaged by the flare, giving me time to reload and put him down, its long and tedious but it works lol