The Guardian boss on Uncharted Ruins of Numa Prime can be difficult if your is unbalanced, uncoordinated and/or uncooperative. The simplest strategy would be to heal like mad and wail at him but I wanted.to know if there were some insightful tips anyone was willing to share.

I know there has to be something we could do with those lamp monsters and the oil puddles.

What I do in a party is let the commando eat up all the aggro and damage. Engies heal constantly and everyone periodically uses damage skills. Use aoe skills to fend off lamp monsters.