The Arihant Type 2 helm reminds me of some of the Halo Reach helmets and looks awesome (but it's not legendary!). I wish there were more legendary\exotic helms that had this Halo Reach style look to them... The helm of imost light is the closest I can get.
It's the visor glass that I miss in Destiny. Most of the titan helms remind me of Luke Skywalkers blast shield and I'd need to use the force to see out of them.
http://a.dilcdn.com/bl/wp-content/uploads/sites/6/2014/07/10-blast-shield.jpg
It'd be really cool to see more helms like these...
http://imageshack.com/f/828/helmetschart3.jpg
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That is a cool looking helmet. Need real options in good endgame gear.