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OrnsteinDragonslayer, the code is so incorrect that it's unclear where to even begin explaining. You should start by noting that the game directly indicates in which function the error occurred and which variable it didn't like. In the provided code, these are absent, which means the error occurred in another part of the combat script. For the rest, I recommend reviewing Novik's manual, especially the section on combat hooks.
Gerter, the combat script knows everything that is in common.lua. If there is no corresponding macro there, you can also look in types.xml, and if there is something needed there, insert it into the script as a number. For example, in common.lua, spells end with:
SPELL_BLADE_BARRIER = 284;
and in types.xml, after it, there are:
SPELL_UBER_METEOR_SHOWER 285 and many others, far beyond 300.
In particular, ABILITY_DEATH_WAIL is 316.
