If an effect or spell changes an NPC's Constitution (e.g. the Belt of Dwarvenkind or the fortitude Ioun Stone), how does it affect that creature's max HP? I'm interested in Constitution decreases as well.
I have a player who wants to wear his dwarf belt as a collar when in wild shape, (which I could say no to) but the ioun stone seems entirely possible.
I'm also curious about how Con changes from such items/sources affect a druid in Wild Shape, if that creature can use the item.
I assume I'd modify by hit dice or CR? But that doesn't seem right.
If a wild Direwolf ((37hp(5d10+10) CR 1, CON 15 (+2)) was affected in a specific way, then should it be any different from a druid wild shaping into a Direwolf?
I was maybe thinking player level would affect this, but player level doesn't affect HP of Wild Shape. Also, if it's a level 3 druid Wild Shaped as a Direwolf, then technically that Direwolf is level 3?
I've read (here) that Wild Shaped druids (that are high enough level to maintain their form) CAN use their beasts hit dice and Con mods during short rests, leading me to believe that Con IS affected by hit dice, but it seems too easy to be correct.
Spells like polymorph and true polymorph match CR with level, but it doesn't seem like something tied to CON