Let's Read the 4e Monster Manual 3: Demon, Quasit
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I believe quasits have been around since AD&D 1st Edition, and they’ve re-appeared in every edition since. This is where they enter 4e.
The Lore
Back when they first appeared, quasits were simply the demon equivalent of Imps: tiny, winged, and tricksy. The only reason they were a different creature at all is was because of the game’s insistence that demons and devils are completely different creature types.
In Dungeons & Dragons Fourth Edition, quasits are… the demon equivalent of Imps. Still tiny, still tricksy, they’re extremely easy to summon as familiars and live to tempt their masters into committing ever more horrible acts of destruction. When one of these masters die, the quasit captures their soul and takes it to its true master, usually a demon lord. Demons don’t need souls, but I guess they’re tasty.
Quasits are usually encountered with whatever dupes they’ve managed to tempt this time or with other, bigger, demons. Minions might include people of any sapient species, with or without a spellcaster. They also like arcanians. Quasits tend to remain invisible for as long as possible and let the others do most of the work for them.
The Numbers
Quasits are Tiny Elemental Humanoids with the Demon tag. They’re a bit stronger than imps by default, being Level 7 Controllers with 75 HP. They have darkvision and a fantastic ground speed of 8, though they’re not winged and can’t fly in this edition.
They’re unusual among demons in that most of their attacks have a trickery and temptation theme, to an even greater extend than an imp. This starts with their Tempter’s Influence aura (2), which inflicts a -2 penalty to saves on enemies caught inside. They can also become Invisible at will with a minor action (1/round), and stay in this state until they make an attack roll.
Their basic attack is a Reach 0 venomous bite, which does physical damage and forces the target to grant combat advantage (save ends). Reach 0 means they need to enter the target’s square, which they can do because they’re Tiny.
Their other attack is Evil Temptation, a mind-affecting spell that targets Will and affects enemies in a Close Blast 3. This is another at-will minor action (1/round), and though it does no damage it dazes (save ends). The “temptation” here is that victims can choose to end the effect early by making an attack against one of their allies!
Final Impressions
So I guess quasits aren’t just demonic imps in 4e. They’re also doing some of the succubus’ job now that she left to become a devil. PCs affected by Evil Temptation are likely to try to shrug it off with saves at first, but if they have a streak of unlucky rolls that friendly fire incident is going to start feeling mighty attractive. Daze is such a serious condition after all…
It’s a genuine temptation mechanic! I think I only saw one other instance of this, for the MM2’s Misfortune Devils. Not even succubi themselves have temptation mechanics, since their powers and “lore baggage” end up making them better for making PCs run away. This is an at-will Blast attack, so you’ll likely have multiple PCs affected by the power at any one time.
Quasits should fight by alternating Evil Temptation and Invisibility, and should hang around close to “tempted” PCs while invisible to make their saves harder. While this is happening, the quasit’s larger allies are going to have a field day with all those dazed heroes. Brutes and artillery work well here.
PC tactics when fighting a group containing a quasit are very clear: crush it as soon as possible. Have your party’s scouts use their high Perception to find the invisible little bugger and smite him with close or area attacks.