Hey,
I'm running the final part of the Hall of Harsh Reflections tomorrow, and it looks to me like the save DCs of gaze attacks of the Octupin, and especially the Advanced Octupin, are off.
The Octupin is listed as having a gaze attack save DC of 18. Assuming that the Slow effect is as a 3rd level spell, then with the Octupin's 15 CHA it should be 10+3 (spell level) +2 (CHA) +2 (feat) , or 17.
The Advanced Octupin has a gaze attack with a save DC of 22. How did this come about? It has the same CHA as the Octupin, and the entry for the creature states that the save DC is CHA based.
Thanks,
Ken
The calculations you listed are for spell-like abilities. For a gaze effect, it should be based off of HD and the relevant ability, in this case, Charisma.
For further clarification, abilities marked (Su) are supernatural abilities, and any save DCs for them are based off of 10 + (1/2 HD) + relevant ability score. (Sp) abilities are spell-like, and calculated just like normal spells.
If the description for a spell-like ability does not say which class the creature "casts" its spell-like ability as (important for setting the save DC as some spells are lvl 2 for one class and level 3 or 4 for another), use the first class that has the spell on their list from the following list:
Wizard/sorcerer, cleric, druid, bard, paladin, and ranger, followed by any additional spellcasting classes as the DM determines.
TK