You must goto gypsy iris and ask her as everybody has a diffrent incantation.
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In order to defeat Master Chard in Magical Starsign you must a spell strike and light magic. Continue to do this and then perform a reflex guard for a slice kick.
All 4 Blast Spells, Air, Water, Earth, Fire in a certain order I think, best look up for a guide.
XP is not calculate when you kill a monster, but every time you hit it. You get XP for every damage point you inflict. In the case of magic spells, you also get a basic magic experience, just for using the spell. I am not sure about ranged.
Hex.
If you mean the caged lesser demon in the Wizard Tower, you can't pass that. However, you can attack with ranged or magic, or with a halberd, and you can pick up any drops with the telekinetic grab spell.--I believe they mean the lesser demons located in the Karamja volcano, north of the Deadly Red Spiders? To answer, you can only open the secret wall during the quest Dragon Slayer, before fighting Elvarg the dragon. Once opened, this passage will remain permanently open to use without requiring quest completion.