@Devs: Question about spell effects

[Mongrel]

Quite a few of the spell effects in zone/spells.cpp do not seem to be implemented.
For example:

case SE_DivineAura:
#ifdef SPELL_EFFECT_SPAM
	Message(0, "Effect #%i: You cast a Divine Aura spell.", i);
#endif
	break;

case SE_ShadowStep:
#ifdef SPELL_EFFECT_SPAM
	Message(0, "Effect #%i: You cast a Shadow Step spell.", i);
#endif
	break;

There are many more like this.

So, here's my question:
Are these effects implemented elsewhere in the code (I searched for the defines and couldn't find anything) or can I start implementing these?

I just added about 40 new spell effect defines to spdat.h and to the "case"s in spells.cpp, I just need to know the best place where to implement them.
I'm thinking about zone/spells.cpp in Mob::SpellEffect() (like the two above) and Mob::ApplySpellsBonuses().
Is that correct?