Syl can also seal herself, unsealing limits on her strength, speed, reaction time, vision, etc. and sealing away distracting thoughts and emotions, etc. She always has these kinds of seals active. There is no hard limit to how far she can unseal strength-related attributes (including speed) and a couple others, but making herself run, say, 25 times faster would be suicidal. She can un-seal her “durability” to accommodate for the backlash of these un-seals, but only so much. With durability “maxed”, she can raise strength-related attributes to, say, ~2-3x normal with no additional risk (active by default). She can relatively safely go up to ~4-5x for short periods of time. She can do short “bursts” of ~6-7x for movements involving a collision (aka hitting something), and up to 9-10x if she won’t hit anything before slowing back down. For these, the first use will usually be safe, but additional uses will put more and more strain on her body. Her ability to easily control these seals caps out at around 9x. She can also use self-seals to "heal" herself. It’s only a short-term fix to keep her fighting, though, and can only do so much. Ex: unsealing pain tolerance, temporarily holding together broken limbs, sealing shut wounds, keep herself awake.
Seals can be done mentally (which has a slight delay), but Syl has a large number tied to small gestures (which allow her to use seals as fast as she can do the gesture). She can make new seals in combat fairly easily, but they have to be done mentally. Syl can combine about six seals into one gesture. Generally, she will start a fight by using a combination of generic debuffs on her opponent: slow the target’s body and casting time, lower their stamina and concentration, weaken their general magical “output” and strength. Spamming seals doesn't work: using one on someone will make them significantly more resistant to the same seal and somewhat more resistant to all seals for a short time. Doing a “six at once” seal cheats this somewhat (all six will work as if they’re the first), but makes them much more resistant to seals until their resistance returns to normal (takes the same amount of time). After the first seal, she’ll usually wait and figure out what will be useful or necessary before using more. She rarely uses full seals (since they’re pretty useless in combat), but if she sees an opportunity, she’ll go for it.
In combat, she's very pragmatic and rational. She will generally try to end a fight as quickly and efficiently as possible. She won’t hesitate to make use of as much “unsafe” buffing as the situation requires. Ex: if she were fighting someone that's immensely more powerful, she might consider an all-in attack where she increases the speed/strength of her arm to, say, 25 times normal. This would **** her up really bad, but if she thought it was necessary she would use a super-risky strategy like this without a second thought. She fights with a sword, which she has trained extensively with. Normally, without any buffs, she has the speed, strength, skill, stamina, etc of a highly skilled martial artist.
Random things she could do that come to mind:
-partial unseal on someone’s wounds to open them more
-unseal someone’s eyes open, seal someone’s mouth closed
-close or enlarge a hole in the ground
-partial/full seal someone’s sword in its sheath
-unseal her sword’s sharpness and other parameters (actually, this is probably something she always does)
-make her clothing provide significantly more defense (this too)
-seal broken bones together to allow her to use unsafe boosts a few more times
-increase or decrease her senses
-make herself resistant to specific things (like fire or whatever)
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DROP THE R AND BACK AWAY!