TL;DR
Leaps into enemy clusters releasing hallucinogenic mist that deals sustained damage, reduces Buffer, and stacks Spidey Venom — exploding to stun, restrict healing, and permanently shred Buffer — while shielding allies outside.
While using this skill, Shroom Spooder leaps into the area most densely populated with enemies and releases a hallucinogenic mist lasting 8 seconds. Every enemy within the range of the mist suffers beast damage equal to 85% of Shroom Spooder's Attack Rating per 1 second. When an enemy hero suffers health loss from an ally's attack, Shroom Spooder receives additional energy.
Lv 3 Buffer of enemies within the range of a hallucinogenic mist is reduced by 30 points. Team-Wide Attribute Buff: HP: 2.41%, ATK: 4.16%, DEF: 7.7%
Lv 6 Every 1 second, enemies within the range of a hallucinogenic mist suffer 1 layer of Spidey Venom. When enemies in this area lose health from an ally Hypogean hero's attack, they receive 1 additional layer of Spidey Venom. This effect can be triggered by each ally hero once every 1 seconds. After lasting for 8 seconds and stacking to 4 layers, Spidey Venom explodes and inflicts on targets health loss equal to 200% of Shroom Spooder's Attack Rating and healing restrictions, for 2 seconds.
Lv 9 When Spidey Venom explodes, it stuns targets for 1 seconds and reduces their Buffer permanently by 12.5 points. This effect can be stacked up to 4 times. Team-Wide Attribute Buff: HP: 2.77%, ATK: 4.78%, DEF: 8.86%
Lv 12 Direct damage received by an ally outside the range of a hallucinogenic mist, from an enemy within its range, is reduced by 60%. The ally is also immune to any control effect from enemies within the range.
Lv 15 The movement speed of enemy heroes with the range of a hallucinogenic mist is reduced by 75%. When a battle begins, Shroom Spooder uses this skill once at the center of the enemy's back line, without consuming Beast Energy. Team-Wide Attribute Buff: HP: 2.89%, ATK: 4.99%, DEF: 9.24%
Lv 18 While using this skill, Shroom Spooder creates a phantom that appears by and taunts the enemy hero with the highest Attack Rating. The phantom inherits all attributes and 50% of the max health of the target, while existing for up to 3.5 seconds. It is unable to use skills.