Tarantula Pet

The Tarantula Pet is a Combat Pet that is rarely dropped by Voracious Spiders and the Brood Mother in the Spider's Den. It is one of three pets obtained from mobs used in slayer quests, with the other two being the Hound Pet and the Ghoul Pet. It only has two rarities, and.

How to Obtain
The Tarantula Pet can be obtained by killing Spiders in the Spider's Den and can be dropped by the Arachne boss. It is unknown whether or not the Tarantula Pet can be dropped by the Tarantula Broodfather.

The Pet has roughly a 1/12000 drop chance (unconfirmed), making it rarer than all Slayer  drops.

Kat Caretaking Costs
Kat can upgrade all rarities of this pet except legendary; this costs varying amounts of coins and sometimes resources. For each level the pet has, there is a 0.3% discount. For example, at level 50 there will be a 15% discount to the price listed below. Also, the cost listed is for the pet of that type to be upgraded, after which time the rarity will be that of the above type. The time listed is also in real life days as opposed to the in-game equivalent.

Trivia

 * Unlike the Wolf Pet, the Tarantula's Combat XP buff only increases XP gained from Spiders. However, the ability is noticeably stronger and, along with the other abilities, it's the ideal pet to use for Spider Slayer.