Excerpt from "'Should I Buy It?' – Universal Remote & Other Exotics"
Light Beyond Nemesis is one of five Warlock helmets, along with The Ram (V). It's also one of three Exotics (one per Class) which features the excellent Keeper of the Pack talent.
Keeper of the Pack – Revive teammates faster. Be revived faster. More Orbs generated with your Super. This is considered one of the best features for an Exotic, also featured on Crest of Alpha Lupi (Hunter). Excellent for PVE (Nightfalls!); also useful for PVP in Skirmish, Salvage, Doubles, Trials of Osiris / Elimination.
SHOULD I BUY IT? Absolutely for non-solo PVE. The increased revive speed is a life-saver in Weekly content – specifically Nightfalls. (They'll practically pay for themselves.) For PVP: it has clear, substantial utility in PVP in playlists with revivals (Skirmish, Salvage, Doubles, Trials of Osiris / Elimination). It's even a justifiable choice for other gametypes with increased Orb generation, although other Warlock Exotics are far too tempting.