Hunter legendary cards, opinions?

[Cat]

Bladestorm is gained fairly early and is probably the strongest I've seen for knockback AoE, but I haven't seen the dark path legendary yet, does anyone know what that does? Light path gets summon Charlie and while I initially dismissed this as a bit useless, a max friendship Charlie with the passive that makes you and Charlie cards crit more, she's surprisingly useful, one of the few cards that also mass mark enemies in a really big area, but considering the fact it costs a card to summon her and she fills your deck potentially, I'm using it less. Bladestorm seems like the most useful overall. But if anyone has the dark legendary and can tell me about it, please do so.

[BunBun]

The dark legendary is Annihilation - Consume all Heroism to deal AOE damage per point spent and it exhausts upgrades to do 50% more per heroism spent still exhausts.

Overall Bladestorm is the best, Charlie is fun but diluting your deck by adding 8 cards and all you get for it really is having another body on the board.

[Cat]

Annihilation sounds good if there is a dark collar passive similar to the light one that makes light cards not exhaust, probably would make it pretty good if the initial damage with 0 heroism isn't too bad.