No worries, sometime all we need is a push is right direction
It appears invisible in RME or ingame? Could be that that the creature.xml in RME/data/10.98 (or whatever u use) does not contain that monster with correct ID's
Example
Lua:
<creature name="Abyssador" type="monster" looktype="495"/>
<creature name="Achad" type="monster" looktype="146" lookhead="93" lookbody="93" looklegs="57" lookfeet="97"/>