Todd Roybark
Hero
That is fair. I felt the same way, until I started playing one. Mechanically it holds up better then I thought it would.High marks for fun factor and theme but not a fan of it mechanically.
Even the most hard hearted, can't ignore Advantage. Since you can't self buff with it, it truly is a blessing for others. I use it on the Wizard's Familiar before it scouts. I use it on the Rogue.Blessing of the trickster is potentially useful, depends on how much stealth scouting your PC can do. It's at will but it's a bit situational. Sometimes brilliant, other times useless as it also relies on the DMs take on stealth.
I use it on the heavy armor wearing Fighter to negate Disadvantage.
Blessing of the Trickster is a nice tool to have and lasts just as long as a Pass W/O Trace spell.
Invoke Duplicity lasts a minute, so it lasts longer the a Warpriest's Guided Strike.Channel Divinity invoke duplicity.
This ability looks great but it requires an action and is very short duration. It doesn't do a lot that going defensive doesn't achieve.
It does require an action, which is unfortunate, especially given an Echo Knight's Echo only costs a Bonus Action, but as a CoT, being able to pre-cast it and surprise someone is a viable option.
Invoke Duplicity with the Elven Accuracy feat can be a beast. 6d10 damage with a Critical Hit with Inflict Wounds is good damage at 4th level. It also can be useful to draw enemy fire, and as a spell range extender since you can cast spells through the perfect illusion.
One side benefit, is that since Invoke Duplicity requires your Concentration to use, it enforces a sort of spell use discipline, which is useful. A CoT can burn through spells very quickly, as they have magic for each Pillar of Play.
Between Mirror Image and Invoke Duplicity, I often wonder if I should take the Sentinel feat down the line just for the extra attacks the feat will grant.
I will admit having 4 duplicates at 17 level strikes me a a micromanagement hassle, but I am nowhere near that level yet..so time might tell a different tale.