Ryougi Shinki the Assassin version is an event limited servant that everyone can obtain as a quest reward from the Kara no Kyoukai Collaboration event. Despite being a free servant, her potential in combat is not to be taken lightly as her critical damage can be way off the top among the 4* servants pool.
Excellent critical damage. As an Assassin class, Ryougi is a servant focusing on critical damage and her skillset helps her a lot in doing that with her passive skills provide her with additional 6% star generation rate and 10% increase in critical damage. Besides that, her second skill Eye of the Mind (False) also increases her critical damage by another 40% at Level 10 for three turns while providing an one turn self evasion for dodging attacks.
High instant kill chance NP. At NP Level 1, Ryougi’s NP has a 100% insta-kill rate before taken into account the target’s death resistance which can also be decreased with her first skill. Therefore, she is a good servant to have when going up against high HP enemies such as dragons or chimeras. Although the insta-kill rate greatly decreases when using against servants, she still can deal quite a bit of damage with it especially if you manage to pull of an Arts Brave Chain as the first skill also increases her Arts cards performance for a turn.
Inconsistent damage output. Ryougi’s skillset is mostly focusing on critical damage but at the same time she has an Arts type NP and a skill to reinforce her Arts cards performance. Therefore, she might not have enough critical stars generated to supply herself as you would be using Arts cards most of the times instead of Quick cards.
Strategies & Tips
Ryougi works well as a critical-focused servant due to her high critical damage buffs which is also excellent at charging up her NP gauge due to her NP efficiency. She also has a skill that sacrifices 1k of her HP for 30% NP charge which is an awesome skill to have considering that she has 11k HP at max, meaning that you would lose 1/11 of your total HP to gain 3/10 NP which is worth the trade no matter how you look at it.
Ryougi’s Noble Phantasm, Yuishinki Chokushi no Magan deals damage to a single enemy while ignoring any sort of defense boost applied to the target. It also has a certain chance of killing the target immediately, which gets drastically decreased when using against servants. Do note that if you managed to kill an enemy with the insta-kill effect you will not gain any NP as no hits are landed.
Helps to increases Ryougi’s NP gauge build up speed with her Stars on Heaven skill and provides additional increase in attack and star generation rate with her Flowers on Earth skill. Besides that, by also having an Arts type NP herself makes NP chaining much more effective.