Step 1: Find a fight that requires you to DPS only for a very short amount of time (20-30 secs). This could be either a zerg (Sarth3D, before kiting Tenebron) or a tankswap boss with a DPS race component, where tank survivability isn’t a big issue. (Prof Putri phase phree, maybe? Sorry, couldn’t resist the mangled alliteration.)
Step 2: Get the Nevermelting Ice Crystal, and chain with Scorpion trinket/Berserk/speed potion/Heroism/Hysteria, if you can get it.
Step 3: ???
Step 4: WIN.