Here's my suggestion.
Find a healer, a DPS too if you don't like long fights.
Start the guardian of the monument quest.
Purposely mess up the order of colours, the giant will be summoned anyway.
Tank him, get healed, afk.
Come back in 10minutes or so and loot your crystal. They don't hit hard, only just enough to require a healer.
Edit: crud, now I'm off to see if I can solo one, brb.
Drat, can't, hit *just* a bit too hard fer solo

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I have ADHD and OCD...I keep forgetting to wash my hands.

