I am finalizing my 5e/d20 hack with a LOT of ICRPG rules and tricks ingrained. Some of the big changes are using Hankerin’s (and Dungeon Craft’s) ideas of flattening out HP for PCs and Monsters and using the TN for all encounters and rooms. Likewise, bonuses will be lower even as players progress with PCs and Monsters rarely gaining more than +6-8 for anything. Most skill and attack rolls will hover around +1 to 5 for most of the campaign. With those as the basis for roll resolution, I am guessing that TN’s need to be in the 10-13 range early and 13-16 later on, with 17 and 18 saved for rare challenges.
Does that sound about right?
Does anyone use similar rules for HP/bonuses, if so what TN range do you use?
Any input is appreciated!