I have been trying to synthesize the advice I have been seeing people give about Command Codes. I am no expert, but what do you guys think of this?
Command Code General Advice and Strategies
First and Foremost: Put Command Codes where they will be useful. That’s very general, but here are some specific ways to employ that advice:
A Command Code that has a debuff resist or ailment removal should go on a Servant you expect to get such debuffs. The most likely example is a Servant with a self-debuff, such as Fran’s burn or the self-stun of Ishtar (Rider)'s Summer Breaker. A second class of Servant this is useful for is one you expect to bring to Challenge Quest content, which often features wide arrays of debuffs.
Conserve your Openers. Low-rarity 1* and 2* Command Codes come in the FP gacha and can be used with some freeness if you wish; they can be overwritten if you don’t mind losing them. It’s the Openers that are likely to be the limiting factor if you use these; they are bought with Mana Prisms and awarded in limited numbers during events. You should probably conserve Openers for higher-rarity Command Codes unless you are fairly sure you have added all of those you want for now.
The Wait and See Strategy:
Conservation is particularly important if you want to hold good CCs for major content like this: say you’re facing a high-difficulty Challenge Quest or boss fight against a Rider that likes to Evade a lot. If you’re already bringing your best Assassins, and you’ve kept Hunter of Love and an opener in your inventory, then one of your already-good chosen team members can get an Ignore Evasion effect on their attack.
Trait damage CCs (Code: Brute for example) can be put on Servants you expect to bring to content that features such enemies. You can use Challenge Quests and boss fights to trigger your trait-damage choice, but if you don’t want the Code to sit on the shelf awaiting such moments, then consider more common missions. If you bring Cú Chulainn (Prototype) to quests that feature Beasts due to his Special Attack damage against those enemies, an extra 5% can improve his performance in that arena a bit more. Servants who have non-NP Special Attack damage versus other types can use the same sort of boost to strengthen their niche. Buster cards are the typical recipients of trait damage CCs. If you have a choice of Servants to use these CCs on, choosing those with better star generation (more Quick cards, high hit counts, or star generation skills), or whom you are likely to team with good star generators, will magnify the effect of this CC by stacking it with higher chances of criticals.
The Minmax Strategy: put Command Codes where they make a large difference in a Servant’s performance.
Do you find it frustratingly difficult to charge a Servant’s good NP because they have only one Arts card or a low hit count on their Arts cards? Adding a star weight Command Code, such as the Armament of Triumph, to such cards will help them crit more often with Arts, greatly improving their NP generation.
On the other hand, some Servants like to do facecard damage with criticals more than NP. In that case, star weight on a Buster card will help, especially if you tend to team them with Riders that pull critical stars away. Crit damage up CCs such as Lady of the Red Jewel will improve damage when critting but not the chance of critting; it is best to use these on Servants with good stargen, or which you intend to use with good star generating teammates.
Star generation – such as the Crest of Humanity CC we just got – usually takes an extra turn to make a difference. Since there is also a cap on star generation bonus, it’s not usually necessary on Servants with any sort of stargen improvement skills. Jack, for instance, will hardly ever want more stargen. It makes a nice additional effect if you frequently Brave-chain a Servant with their Buster or Arts cards though.
The Sentimental Strategy: improve the Servants you like and use a lot.
A Command Code is no good if it doesn’t get used! If you have a go-to Servant, a Command Code that gets used often will have more effect on your game than one sitting on your bench.
A sentimental way to reduce your analysis paralysis is to put CCs on the cards of the Servants they feature. You got BB Slot and you have BB? Put it on one of BB’s cards! Lady of the Red Jewels features Rin’s Command Seals – why not put it on an Ishtar or Ereshkigal? It’s not necessarily always the most effective use but it makes sense and is its own kind of fun, and in the end this is all a video game.
The last piece of advice:
Few Command Codes have a drastic effect on the game. The low-rarity heals, for instance, are unlikely to make a big difference in most battles. Five “Code: Bless” on a last-man standing Servant will heal them for 300 per turn, which might, over the course of a few hard-fought turns, buy you one more round. Sometimes that makes the difference though!
For the immediate future, the rare CCs with debuff immunity/clears are likely to be the ones that really have specific Servants where they’re extremely useful: put them on Servants that debuff themselves. Other than that, don’t overly sweat optimizing your choices.