Look for them in Edgeville Dungeon
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First of all , master Firemaking to level 50 (the higher the number, the better) Any other qualifications are not needed, but the amount of experience gained from RS gold the various activities in minigames (those tasks are linked to Herblore, Woodcutting, Fletching and construction abilities) scales positively with level of skill. So it's an excellent opportunity to improve in your particular area of expertise.
When your Firemaking is strong enough gather at least 4 pieces of clothing that are warm (ie. bunny outfit, Santa hat Rainbow scarf, Fremennik gloves, fire cape, fire staves, tome of flame), foods, replenishment potion, knife with hammer, axe and tinderbox. When you're all set, go to Wintertodt Camp (located inside the the northern regions of Arceuus) in Great Kourend and help pyromancers in containing Wintertodt by keeping the braziers lit and ensuring that none of these weak wizards get out of the way due to being controlled by a boss.
Look for them in Edgeville Dungeon and Taverley Dungeon. Particularly susceptible to Ranged weapons Combat level 13 chaos druids provide easy target, but be cautious for osrs infernal cape them as they are often haunted players who kill, so carry only items for combat that are required and bring one-click teleporters with you just in case. There is no specific requirement other than membership.