I set out to make a half-fiend rust monster, I thought it would be quite cool with dragonfly-like wings ambushing the party from hiding in a huge underground cavern, it seemed like it would make an awesome scary encounter and what is more evil than a rust monster in the mind of a typical adventurer ?
The creature ended up a bit different, increased HD slightly, changed the DR from DR Magic to Good, Changed it's spell-like abilites and enhanced resistances and immunities slightly to mirror those of Daemons deeming it fitting for a creature of corruption and decay. Also I added some acid damage to the bite attack and removed the smite good ability.
It ended up being a bit more powerful than a typical half-fiend, but I think it still qualifies as a CR 5 creature. I'd like some feedback or suggestions on this creature, diabolical GMs are free to drop it in their games ofcourse.
NE, Medium Outsider(Augmented Abberation)
initiative +5, Darkvision 60', Scent metals 90', perception +14
Ac 21, touch 15, flatfooted 16(+5 dex, +6 natural)
hitpoints 45(6D8+18)
Fort +5 Ref +7 Will +7
Defensive Abilities DR 5/good, immune to poison, disease, death effects and acid, resist cold 10, electricity 10, fire 10, SR 16
speed 40' Fly 80' Climb 10'
Melee Bite +9(1D6+2+1d6 acid), 2 Claws +9(1D6+2), Antennae +4 touch(rust)
Spell-like abilities 3/day - Blur, 1/day - hold person(DC 12), haste(self only)
str 14, dex 21, con 17, int 4, wis 15, cha 10
Base Attack +4, CMB +6, CMD 21(25 vs trip)
feats Ability Focus(rust), Skill Focus(perception), Weapon Finesse
Skills +10 climb, +14 perception, Fly +14, Stealth +11
Rust as rustmonster but 3d6+6 damage against metallic creatures and the rust DC is 18.
Scent Metals as rust monster