3 years too late but I googled the same question. This is a simple fix I found to show bot spell damage.. It's not optimal I'm sure. I just added 
 
entity_list.MessageClose(this, false, 100, MT_Spells, "%s hits for (%d)", GetName(), -value); 
 
to the Bot.cpp right above the     return value;     in GetActSpellDamage 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
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