•Dinendal, Hunter of Foul Folk ![Elven [Elven]](https://lotrtcgdb.com/forums/Smileys/classic/elven.png)
Strength: 6
Vitility: 3
Resistance: 6
While you can spot a roaming minion, Dinendal gains Archer.
Archery: While you can spot a minion with the strength of 6 or less you may exert Dinendal and make the fellowship archery total -2 (to a minimum of 0) to return that minion to its owners hand.
I am a nitpicker, and before I can properly review your cards I need to point a few minor sins you have committed. First, never ever ever use 'may' in a special ability, as using 'may' gives the ability's owner the option of paying no cost for all the effect. Second - and this is more of a general rule of thumb - try to use 'if' instead of 'while' for conditional requirements at the start of a special ability; it's a lot more concrete and a lot less confusing.
Never capitalize keywords.
Archery: If you can spot a minion with strength 6 or less, exert Dinendal and make the fellowship archery total -2 (to a minimum of 0) to return that minion to its owner's hand.
I know, I'm a dweeb. But I'm also a writer with an eye for details.
Oh, and this almost feels like an afterthought, but the card itself is fine. haha.
•Thingol, High King of the Sindar ![Elven [Elven]](https://lotrtcgdb.com/forums/Smileys/classic/elven.png)
Strength: 8
Vitaility: 4
Resistance: 6
Thingol may only bear artifacts.
Skirmish: While Thingol bears an artifact, you may exert him to make him strength +1 for each wounded minion.
Strike that 'may' from the ability and change 'while' to 'if.' Also, even though it isn't entirely necessary, you should tack on 'you can spot' after 'wounded minion.' That way the FP player can control how much strength Thingol actually receives. He needs cultural enforcement. Something easy like 'To play, spot an Elf' would work just fine.

•Thingol's Cloak ![Elven [Elven]](https://lotrtcgdb.com/forums/Smileys/classic/elven.png)
Artifact Cloak
Resistance +1
Bearer must be an Elf.
Response: If bearer is Thingol, each time a shadow skirmish event is played you may exert Thingol to discard a condition.
What a bland name for an artifact! Make up something that's worth more Cool Points, like
The Shade of Thingol or
Cloak of the Sindarin.
Very strong response ability. The wording you're using for it though is more suited for a triggered ability and not a special ability. Always remove 'each' from special abilities and reword it to react independently to each instance (see below).
I would recommend dropping the twilight cost to 1 (no cloak should ever cost 3, in my opinion) and pulling back the power level a bit. Maybe:
Response: If bearer is Thingol and a Shadow player plays an event during a skirmish involving another Elf companion, exert Thingol to make that Shadow player discard one of his or her conditions.
Definitely not as strong as yours, but it's a cloak, not a sword. It needs to be subtler.
•Legolas' bow, Deadly at Close Range ![Elven [Elven]](https://lotrtcgdb.com/forums/Smileys/classic/elven.png)
Possession - Ranged Weapon
Bearer must be an Elf.
Bear gains Archer.
Response: While the bearer is Legolas each time a shadow event is played in his skirmish, you may exert Legolas to wound a minion.
Wait, so the Elf becomes a Bear?
Capitalize 'bow.' You know, I really like this bow. Not only did you tie in the ability with the subtitle, but you gave the FP player another way to access Legolas' vitality.

Same issue with using 'each' in the special ability. This is what it should look like:
Response: If bearer is Legolas and a Shadow event is played during his skirmish, exert him to wound a minion.
Keep on posting!