User blog comment:DauqS/Hillan, the Peacemaker/@comment-10594216-20130726125023/@comment-5331854-20130726173617

First: Forget Lich Bane or any other item if you want to reason skills. You can put them into recommended builds, but a kit should be able to stand on its own feet.

Tranquilizer: Without the Lich Bane-argument, there's only the great synergy with W you're stating. The passive itself is fine and fits the kit, this has never been a problem for most of us.

Peace of Body: It's fine. Since she depends on AA for bursting, the increased range is cool for a melee assassin. The warmup is just so that the player has to think before landing a kill with the ult in a teamfight. That's why instant invis (like Talon or Vayne) is restricted to the ult.

Peace of Mind: While silence is strong, I'm thinking that anything movement-impairing is even stronger against her because she can run away while being silenced (and your beloved Lich Bane provides MS). Most silences gives you a short time to react, so popping the E (which is ready most of the time when leveling it) before getting hit is possible, so the silence gets waisted. Movement-impairing CC is more fatal, but needs to be, because it's a natural counter against everything very dangerous. It's enough if it can transfer slows and silences already movement-impaired champs.

Peace of Soul: Exactly like you said, she needs something like this since she can rely on Q for closing, but not for escaping.

Coup de Grace: I thought so that it gave you stress, it's not easy to find an ult that fits her and isn't copied from existing champs. Yes, it is a finishing tool and should be used as one, but instakilling after hitting a threshold... Every skill needs counterplay, it's what makes LoL great in my eyes (you can't faceroll combos, at least not when playing against skilled players). You can't counter instakills. Maybe you can use true damage, but not that high. Hmmmm... How about making the AoE I mentioned earlier doing true damage? You still need to go a bit lower than the threshold for guaranteed kills, but true damage in AoE is something that the enemy would fear... Wait, how about this:

"If Coup de Grace strikes a target with health below the threshold, Hillan does a swift spin for the execution, making Coup de Grace deal 100% true damage at the target and 40%/50%/60% of that damage to nearby enemies."

Needs better wording, but the replacement effect would allow you to make the damage itself higher and it still wouldn't be an automatic instakill, but it automatically deals more damage because the magic damage turns into true damage, something that needs good healers/shielders to counter (in short time nonetheless, since Hillans burst is pretty fast).

I hope I could give you some inspiration, even if my suggestion may be crap XD