After obtaining a Giant Key from a Hill Giant or Cyclops, you can face Obor the Hill Titan. This boss is one of few that can be accessed by F2P players. Find him by the Hill Giant area in the Edgeville Dungeon.

Obor - Free-to-play Melee Guide

Obor has two main attacks – Melee and Ranged. If you choose to use the Protection from Melee prayer, Obor will only use his Ranged attack and vice-versa – it’s therefor not really worth the prayer points to use any Protection prayers during this fight, you will however want to use any offensive melee prayer you have at your disposal.

One important thing to note is that Obor has a special attack which will throw you across the room. To negate this, you should stand up against a wall while attacking him.

Obor Video Guide