To defeat ocram you will want either adamantite or hallowed armor.
I recommend having at least one friend to help you, and if you do you will both want at least mythril armor.
You will also need greater healing potions, the excalibur, the demon scythe, the megashark, and the hallowed repeater.
Use your old sky bridge from when you battled the twins.
For the first form just sit there and kill him with the demon scythe, then when in his second form use the mega shark or just keep using the demon scythe while running back and forth on your sky bridge.
It shouldn’t be to hard to kill him but if your having trouble just get more friends together to fight him with.
Hope this helps 🙂