Neither the target can move while this spell is in OSRS gold effect. It lasts for up to 40 seconds that you count as in combat. Your target cannot fight, use ranged attacks but may mage but this hits at half. Any struck you choose breaks the charm. Your prayer level drains at the speed as if ultimate strength was active, your magic level drains once this has reached 0. So lets analyse the way you would struggle with these.
Oviously opening with fate and cosmicality will force the competition to remove his armour and subsequently an anti buff to cut back his defence. Subsequently diseasing and poisoning the opponent to take his stats and also do any harm. Holding them palce with transfix and then let toxin kill them. Drag fights outside to eliminate there food and ammo. There would be a weakness, even should you get into combat you may take huge harm from the buffs you have put onto them meaning a quick death. How to obtain them comparing shortly.
I've thought about something in RS and buy RS gold thought my thought may make the match more colourfull. Present situation: if you combine items which aren't assumed to be united, you get standart"nothing interesting happens". My suggestion: alter it so that something interesting happen.