The Illustrated Atlas of Insectoids provides this bestiary entry.

Bestiary entry Edit

That's the kinda john we call an 'armored arachas.' Hard and prickly on the otuside, but get 'im undressed and everything's soft and squishy.
– Foxy Lisa, Maribor prostitute
An arachas' only weakness is its soft, sensitive abdomen. Some arachasae hide this under hollow tree stumps, while other, "armored" varieties exist which have grown a thick carapace that covers all the more delicate parts of their bodies.
An armored arachas is a true behemoth. It uses its enormous mass to knock over and trample its victims then devours their crushed remains. Like all arachasae, it is highly venomous, and this Golden Oriole should always be consumed before fighting it.
It is also worthwhile to stock up on healing potions and crossbow bolts before setting out, for this arachas' thick plating can withstand a great deal of damage, making battles with it a long and exhausting affair.

Combat tactics Edit

Once provoked, arachasae of both varieties quickly attempt to close the gap between them and their prey, either by skittering across the ground, leaping at their victim, or by spitting a sticky secretion and dragging the unlucky soul to them. In close combat an arachas is brutal and fast, its sharp foreclaws lashing out at incredible speeds. Skilled witchers can actually parry these strikes and temporarily stun them.

If both forelegs are raised and its mouth is exposed, the arachas strikes with such force that no man, or witcher, alive can hope to stop it. This happens with such speed that the attack may still strike true even if the victim knows it's coming. Golden Oriole is a must against all insectoids. Bites from an arachas are inherently venomous. They're also fond of spitting venom at distant targets.

Yrden can slow arachasae down just enough that melee combat is made simpler. Good bolts for a crossbow can be of great help against arachasae, particularly when they open their mouths wide. The armored variety of arachasae can resist sword strikes even more than the other species. The carapace surrounding their abdomens are particularly problematic.

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