Guild Wars 2

I keep dying when I fight two or more Risen underwater even though I have a mix of green/yellow/orange armor/accessory.

I only have a level 80 green spear/speargun. It doesn’t even make a dent on their hp.

Any advice on making underwater content easier for solo warriors? Easy enough to make underwater a walk in a park?

I want to spend more time exploring than struggling to live.