The material below is Open Game Content from a 3PP Source
Rattling with each stride, this looming, horned, skeletal figure clutches a wicked staff. A seething glow burns in its eye sockets.
Thanadaemon (CR 13; 25,600 XP)
NE Medium outsider (daemon, evil, extraplanar)
Init +7; Senses darkvision 60 ft., true seeing; Perception +25
AC 27, touch 14, flat-footed 23
(+3 Dex, +1 dodge, +13 natural)
hp 172 (15d10+90)
Fort +11, Ref +12, Will +14
DR 10/good; Immune acid, death effects, disease, poison; Resist cold 10, electricity 10, fire 10; SR 24
Speed 30 ft.
Melee +2 quarterstaff +22/+17/+12 (1d6+9 plus energy drain) or 2 claws +20 (1d4+5 plus energy drain)
Special Attacks draining weapon, energy drain (1 level, DC 21), fear gaze, soul crush
Spell-Like Abilities (CL 15th; concentration +19)
Constant—air walk, true seeing
At will—greater teleport (self plus skiff and passengers only), plane shift (self plus skiff and passengers only, Astral, Ethereal, and evil-aligned planes only)
3/day—animate dead, desecrate, enervation
1/day—summon (level 4, 1d4 hydrodaemons 80% or 1 thanadaemon 35%)
Str 21, Dex 16, Con 23, Int 17, Wis 17, Cha 18
Base Atk +15; CMB +20; CMD 34
Feats Alertness, Blind-Fight, Dodge, Improved Initiative, Iron Will, Lunge, Mobility, Power Attack
Skills Acrobatics +21, Bluff +22, Diplomacy +22, Intimidate +22, Knowledge (planes) +21, Knowledge (religion) +21, Perception +25, Sense Motive +25, Stealth +14, Survival +10
Languages Abyssal, Draconic, Infernal; telepathy 100 ft.
Environment any (Abaddon)
Organization solitary, pair, or council (3–11)
Treasure standard (+2 quarterstaff, other treasure)
Draining Weapon (Su) A thanadaemon's energy drain attack functions through any melee weapon it wields.
Fear Gaze (Su) Cower in fear for 1d6 rounds, 30 feet, Will DC 21 negates. This is a mind-affecting fear effect. The save DC is Charisma-based.
Soul Crush (Su) A thanadaemon can crush a soul gem (see cacodaemon) as a standard action to gain fast healing 15 for 15 rounds (this is a standard action). This action condemns the crushed soul to Abaddon—resurrecting this victim requires a DC 28 caster level check.
While all daemons represent death in some fashion, thanadaemons, the Deacons of Death, represent the inevitable death through old age. Thanadaemons effortlessly work eerie skiffs along every pus- and bile-choked river in Abaddon, including the legendary River Styx. For the right price (typically 50 pp or 2 gems worth at least 300 gp each), a thanadaemon will even carry passengers on its skiff, yet those who travel with these fiends should beware—they frequently renegotiate the terms once they've got their passengers in dangerous realms.