You just need to have a knife and some logs in your inventory and click on the pitfall traps in hunter areas, use a teasing stick to prod an animal which will then chase you, jusmp over your trap and hopefully the animal will fall in, it's best to set up at least two traps.
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Click Set-up cannon stand. Your RuneScape character will automatically set up the rest.
Torva set
Yes you can own as many cannons in runescape. But it will only let you set out one cannon only.
There is no such armour in RuneScape. If such a set existed, it would a) exist on the Grand Exchange, and b) have an article on the RuneScape Wikipedia (both official and unofficial Wikis).
set a security question, hence, security chest