I need advices for Legion

1): In Feral Frenzy, Legion loses access to their lunge (charged attack). This is because it's a special attack, and those do not have lunges. It's annoying to get kicked out of Frenzy due to a miss (especially when Aim Dressing appeared to contribute), but otherwise survivors wouldn't really be able to try and juke the ability (before their rework, Legion could just spam Frenzy attacks with no cooldown between swings).

2): You do want to respect pallets unless you're playing against a survivor who uses that as bait (ie, they pause and continue looping instead of dropping the pallet). If they drop it early, you can vault it and hit them. If you have to take the stun to force the pallet down, well that's one less pallet. I haven't tried it in a while, but Legion also might be able to use Enduring to purposely take pallet stuns and exit Frenzy significantly faster (I'm not sure if this still works or if the Devs adjusted it for Legion). Taking the stun can be helpful if Frenzy is about to run out (pallet stuns are shorter than Frenzy Fatigue), but otherwise you are potentially throwing away your entire power meter.

3): Legion cannot see scratch marks while in Feral Frenzy. It's not a bug, it's just how their power works. This is why Frenzy is exclusively a chase ability and not a mobility power. You need to maintain line-of-sight as much as possible, and make predictions about where survivors have gone if they can break it. Scratch marks should return the second you enter Fatigue after Frenzy ends, but they don't always come back that fast.

Basically, you want to exert pressure on the survivors by constantly injuring them and then interrupting their heals. Use Frenzy to inflict Deep Wounds on one survivor and then see if Killer Instinct reveals any other nearby players. If possible, wound them too, but return towards where the first survivor was when Frenzy starts running out; you can often start a chase with an injured survivor who may have just finished mending in a bad spot (and wasn't expecting to see Legion back so soon).

Otherwise it's all about understanding how to just run basic chases well to secure a few downs and choosing when to abandon chase to pressure other players off of gens more effectively.

Legion's not top of the crop by any means and can struggle against coordinated survivor groups, but they aren't exactly worthless either. Legion also has the distinction of being the best Bloodpoint Generator in the game (it is pretty easy for them to max out most BP categories in a match).

Against good survivors wait for them to juke before swinging. Thats important for most killers but especially true due to the huge penalty missing an attack during ff can be.