i have a 70 fire mage with presence of mind, with 535 bonus fire damage, my pyroblast usually hit for about 1800, my highest crit was 3805 + 40% ignite= 5325 dmg( with no buffs from other players)only had molten armor, AI, and combustion.

oneday i got lucky and did pyro for 2800 +1 tick of ignite for 373.cast presence of mind, and another instant pyro for 2205 + 294(1 tick)ignite( this ignite overides the 1st= )and a 2177 fireblast + 40% ignite for 871(this ignite overides the previous. and theres a dot that comes with pryo and does 348 damage( i think)for a total of 9068 dmg