Althoguh only one I bothered finding the exact text on was the spoiler'd convo rest was just off my own memories of the general concepts. My main sources being the Waterfall lore, the above spoilered out convo, and possibly a little bit of Snowdin Library. So 'about' 40-70% of what energy SHOULD have been given to Asriel never was, and that would still be significantly slowing their own aging. So they still have all the soul power it would have taken to move Asriel from childhood into teenageer into young adult within them. this was a phase Toriel and Asgore regretfully would never reach. But even some regular monsters have longer lifespans than others, such as Gerson.īut. As such, they'd then be subject to regular aging rules of monsterkind from that point onward. Perhaps it'd only mildly stronger than a regular monster. Probably not gasping for breath life support as soon as the kid hits the monster equivalent of 18 or 21.īut there'd be some loss. To such an extent that it may be incorrectly perceived as eternal/immortal.Īt the end of their child's growth, the parents would have significantly weaker souls as a result of giving so much of their energy to their offspring. Lifespan/aging is based on the strength of the monster soul? Boss Monsters, having the strongest of monster souls (as proven by their souls being able to maintain a physical form briefly after death), would have the longest lifespan. Now THIS PART is a bit more speculative theorycrafting. Had a little lay in bed for a couple minutes, walked two laps around the house and thought this up. A Boss Monster is an anthropomorphic goat-esque type of monster which has the differentiating trait known as SOUL persistence. The fact that they all can use fire magic and Asgore using a trident also supports this, as the devil is often associated with fire and the trident.OK.Many powerful RPG bosses are devilish, hence the name and significance also back this up. However, this is made mundane since Boss Monsters are essentially anthropomorphic goats. The goat theme may very likely be a deconstruction/reconstruction of typical devilish traits, as devils often have goat traits and goats are used prominently in Satanic symbolism.Boss Monsters rule over the Underground, which likely explains their name. All currently known Boss Monsters are also part of the same royal bloodline. Although not necessarily intrinsic characteristics of Boss Monsters, the three of them share several traits namely, a resemblance to Nubian goats, long droopy ears, visible fangs, a pair of horns, anthropomorphic bodies, paws at the end of their extremities, and an affinity for fire magic. There are currently three known Boss Monsters: Toriel, Asgore, and their son, Asriel. Similar to other monsters' SOULs, the souls of Boss Monsters are white. When a Boss Monster dies, their body turns to dust however, their SOUL, in an upside down heart shape, lingers for a few seconds before shattering. This explains Asgore and Toriel's longevity as their son, Asriel, died at one point, and they therefore cannot biologically age.

Boss Monsters only age when their offspring does.

All Boss Monster encounters activate Serious Mode. Although all Boss Monsters are also bosses in Undertale, not all bosses in Undertale are Boss Monsters.

Boss Monsters' SOULs persist briefly after death. A Boss Monster is an anthropomorphic goat-esque type of monster which has the differentiating trait known as SOUL persistence.

The game's lore explicitly states two things:

A Boss Monster is an anthropomorphic goat-esque type of monster which has the differentiating trait known as SOUL persistence.

Boss monster undertale