After a recent tweak, it looks like rebuke (single target multi-strike TM spell) is capping at 3 hits. It used to cap at 6 if I remember correctly.

Rebuke at 95 mana:

You rebuke a young wyvern with your pavise shield.
Your cambrinth manacle emits a loud snap as it discharges all its power to aid your spell.
Waves of shimmering silver light shine from the shield which crash over the young wyvern.
The first wave inflicts a good (4/23) hit to a young wyvern's slitted left eye.
The staggering force drives him to his knees!
The young wyvern is lightly stunned!
The second wave inflicts a good (4/23) hit to a young wyvern's scaly chest.
The overwhelming force crushes him to ground!
The final wave inflicts a good (4/23) strike to a young wyvern's scaly chest.

Roundtime: 1 sec.