Yeah it's max + 0.5xrolled.<br/><br/>1.5xMax is more on average (0.5 max > 0.5rolled) With d6s, rolled ~ 7/12ths max, so 0.5 rolled ~ 7/24ths max which is halfway between 1/4th max and 1/3rd max, so either of those can be used for simplicity. This gives an average result closer to FAQ. But I'm not gonna object to the DM bumping it.<br/><br/>(....unless maybe we fight an enemy who does it!  >:))<br/><br/>The designers try hard to make things stack additively rather than multiplicatively....but some things like Twin Spell still will (I think...or maybe the second copy of twin spell doesn't benefit from other metamagic feats, I forget). Some of the Final Fantasy games are hysterical b/c everything stacks multiplicatively.