Hilde has a unique system in where she holds down A or B for 1 to 30 seconds. Holding down the button can produce one of 4 different levels of attack. C1, C2, C3, or C4.
With the B's, C1B is a stab, C2BB is a 2 part Stab Launcher, C3B is a giant launcher and C4B is a 180 unblockable stab. If she's crouching when you release the B, FC C1 is a Shouryuken, FC C2B is a hilt end launcher and FC C3BBA is a stab into launcher into a horizontal.
With the A's C1A is a slash with good stun on CH. C2AA is a guard breaker with auto GI properties against mid or High A's. C3A is her god move that crouches and aGI's A's and B's. C4A is a 100 damage Unblockable. When crouching, FC C1A is similar to C1A, FC C2A has aGI proeprties not sure, but I think it's A's. On CH gives unshakeable stun. FC C3A is her only High charge, on CH the follow up is guarenteed. the FC C3AKB is a launcher, the FC C3AKA is a low with unshakeable stun on CH (sets up a tech trap into C3B).