I myself have gotten plenty of Gladiator points in the first days of Nightfall, when it wasn't very popular yet, and grew bored of it before it even got popular in Random Arena's (Home of the infamous Touch Ranger as well).
Then [skill]Burst of Aggression[/skill] got 'lowered in efficiency' (I'll try to stay away from that overused n-word), and people looked for the few alternatives that Assassin dagger chains could bring. People used [skill]Tiger Stance[/skill], [skill]Lightning Reflexes[/skill], [skill]Flail[/skill], [skill]Flurry[/skill] (or even [skill]Frenzy[/skill]). But it basically was the same build all over again:
Shadow Prison -> Off-Hand that requires a hex -> Dual Attack -> another Off-hand, often hex-based (Falling Spider in a few rare cases) -> Dual Attack.
This skillbar has varieties, be it with a self-heal: [skill]Feigned Neutrality[/skill], a snare as a back-up hex in case Shadow Prison isn't enough: [skill]Siphon Speed[/skill], and sometimes a back-up plan in case the opponent has stances/blocking enchantments: [skill]Expose Defenses[/skill]
Well. I'm bored of all of that, and made a few builds of my own, huzzah!
They range from mediocre to great, but it's up to you whether you stick to your cookie-cutter Shadow Prison sin (which any decent player will counter easily), use the Yansassin, or use some of my random builds, if not slightly change them at your preference.
Zealous Daggers are recommended of course, unless the build uses Conjure X
1.
Let's start off with my very first idea.
I basically wanted to have a build using [skill]Palm Strike[/skill]. Quite hard, actually, since Nightfall brought us a better, non-elite alternative to skip the Lead Attack, especially through its synergy with Black Spider Strike, any any hex that lasts long enough for the combo.
Righto, time for the first build itself.
Dagger Mastery 10+1+1
Deadly Arts 6+1
Shadow Arts 6+1
Critical Strikes 12+1
[skill]Siphon Speed[/skill][skill]Black Spider Strike[/skill][skill]Death Blossom[/skill][skill]Impale[/skill][skill]Palm Strike[/skill][skill]Resurrection Signet[/skill][skill]Deadly Paradox[/skill][skill]Feigned Neutrality[/skill]
Template Code: OwBk0pe2HOuztjMfwSgVQBAPKND
The order in which the skills should be used seem obvious, a second Death Blossom usually finishes your target. The most fun thing about this one is the huge drop in health of your target when doing Impale + Palm Strike.
Very energy heavy as well, which is the main problem, so 13 Crit Strikes is a must, making you sacrifice your selfheal capability slightly.
Update: Well, Moebius Strike would be better in the long run indeed... I'll just leave the build here for the sake of telling you how I came up with n°2
2. A slightly modded version of n°1, when I wanted to get [skill]Shattering Assault[/skill] in a build to counter the upcoming Shield of Regeneration bonders after its buff.
Dagger Mastery 10+1+1
Deadly Arts 10+1
Shadow Arts 8+1
Critical Strikes 8+1
[skill]Siphon Speed[/skill][skill]Black Spider Strike[/skill][skill]Shattering Assault[/skill][skill]Impale[/skill][skill]Signet of Toxic Shock[/skill][skill]Resurrection Signet[/skill][skill]Deadly Paradox[/skill][skill]Feigned Neutrality[/skill]
Template Code: OwBk0pe6HOiztjMLmTgvZBAPKND
Fun to use if you're sick of enchantment tanks.
After using these builds for a while, I noticed it was basically the same start: use a hex, use a hex-dependent Off-Hand Attack.
This had to change, and I turned to the Elementalist Secondary.
3. A/E Any Element
This build is fine with any Conjure spell, but I'll use Lightning, since my PvE sin has daggers with those mods.
Elementalist Element of your choice: 8
Dagger Mastery: 10+1+1
Deadly Arts: 7+1
Shadow Arts: 8+1
Critical Strikes: 8+1
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[skill]Golden Phoenix Strike[/skill][skill]Horns Of The Ox[/skill][skill]Impale[/skill][skill]Moebius Strike[/skill][skill]Resurrection Signet[/skill][skill]Deadly Paradox[/skill][skill]Feigned Neutrality[/skill][skill]Conjure Lightning[/skill]
The skill chain basically says it all, give it a try ^^
4. A/E Conjure Shocker
Dagger Mastery: 10+1+1
Deadly Arts: 7+1
Shadow Arts: 8+1
Critical Strikes: 8+1
[skill]Shock[/skill][skill]Falling Spider[/skill][skill]Death Blossom[/skill][skill]Impale[/skill][skill]Resurrection Signet[/skill][skill]Deadly Paradox[/skill][skill]Feigned Neutrality[/skill][skill]Conjure Lightning[/skill]
Template Code: OwZlggdq39hj4cOUYHsEoAgHlm7G
Currently my fav build.
Targets usually die after the Impale and your first Dagger hit after you've used it.
The main problem with this one, is the Exhaustion piling up. I've tried to keep the chain as 'cheap' as I could by sticking to 5e skills, but if you constantly spike whenever you can (let's say every 15 seconds, due to Impale's recharge), you'll find yourself in an annoying situation after 4-5 spikes.
Also: no Elite Skill, lawl, any suggestions which skill could be replaced by an elite effectively, feel free to tell me.
Update: Well, I suppose Shadow Prison, or Aura of Displacement could be brought instead of Deadly Paradox, but it'd get too energy heavy, especially with the exhaustion. Any shadow stepping skill could work, basically.
5. A/E Conjure Flame Burninator
Well, I decided to give this element a shot as well, but it basically put me again in the hex-dependent skill line.
Fire Magic: 10
Dagger Mastery: 10+1+1
Shadow Arts: 8+1
Critical Strikes: 8+1
[skill]Black Lotus Strike[/skill][skill]Horns Of The Ox[/skill][skill]Falling Spider[/skill][skill]Twisting Fangs[/skill][skill]Resurrection Signet[/skill][skill]Feigned Neutrality[/skill][skill]Conjure Flame[/skill][skill]Mark of Rodgort[/skill]
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No elite again this time... same thing for Shadow Prison attack skills, you can switch out any that you like (example: Lotus, Twisting Fangs, Spider, Blades of Steel)
It'll spike better than Shadow Prison sins due to the heavier degen, but the lack of snare is quite a nuisance.
Condition Removal isn't really in my builds, but for the first 2, you could simply go A/Mo, and bring Mending Touch instead of Deadly Paradox

Shadow stepping isn't either, same thing applies if you don't like Deadly Paradox.
You might have noticed that I have Deadly Paradox + Feigned Neutrality, making me spread my attributes quite loosely. This is what I usually do, but I made sure the builds have just enough punch to kill 60-80 AL targets.
But, if you want to grab gladiator points in RA (for example) and hope that you get a decent monk, you might as well leave out any points spent into Shadow Arts, drop Feigned Neutrality, and grab a snare, interrupt, or shadow stepping skill.
Actually, anything not directly involved in the spike can be tossed out and replaced. It's up to you what you want to do with your freedom within the build

Hope you enjoy playing something else than that boring Shadow Prison sin

EDIT: Also, the Skill Codes seem to not work, yay >.>
EDIT 2: Okay, they work now... just refresh if they don't

EDIT 3: Added extra notes on some builds, I'll likely add more builds here as I come up with them, instead of making separate threads.
Also added some comments in the end.