Requirements:
Step 1:
Begin by speaking to Aris in the northeast corner in the ;;thieve room near the bank chest.
Step 2:
Speak with Aris and agree to participate in her game (safe mini-game for regular hardcores (hardcore group ironmen will lose a life if you die in this area), you won't lose your items if you die).
Make sure you're geared and ready as you will be teleported into the room to fight (prayers cannot be used)
I recommend using melee for the first boss as you wont be fighting any of the other ones since you can rejoin the fight 5 times after the initial kill to complete the quest.
Step 3:
Kill the first of the 6 bosses, you should leave the portal to replenish health at the nurse just west of Aris or by eating food at the bank, leaving after a kill will save your progress each time.
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Recommended equipment/inventory:
Step 4:
You've completed the quest once you've killed the first NPC 6 times - Right click the chest just east of Aris to buy your gloves