Wyrm Rhyme Saga
At first level characters receive the maximum hit points for their class as described in the rules. At all subsequent levels, the characters roll hit points as specified for their class. If they roll lower than half of the possible hit point (rounded down) then they get half hit points (rounded down). For example, a rogue rolls a d8 for each level. If he rolls a 1, 2, 3, or 4 then he will get 4 hit points for the level. On a 5-8 he will get the rolled number of hit points.
Hit point modifiers for Con, feats, etc. are applied normally to the result determined above.