Human - Spiderman

1. execute @e[type=item,name="Spiderman Gem"] ~ ~ ~ kill @s
(Repeat, unconditional, always active)

2. give @p web
(Chain, conditional, always active)

3. give @p string
(Chain, conditional, always active)

4. give @p snowball
(Chain, conditional, always active)

5. setblock (~ ~ ~) redstone_block
(Chain, conditional, always active)

6. effect @p resistance 99999 3 true
(Chain, conditional, always active)

7. effect @p strength 99999 5 true
(Chain, conditional, always active)

Spiderman - Human

1. kill @e[type=snowball]
(Repeat, unconditional, need restones)

2. setblock (~ ~ ~) air
(Chain, conditional, always active)

3. clear @p web
(Chain, conditional, always active)

4. clear @p string
(Chain, conditional, always active)

5. effect @p clear
(Chain, conditional, always active)

Cobweb

Part 1.

1. execute @p ~ ~ ~ execute @e[r=100,type=item,name=Cobweb] ~ ~ ~ detect ~ ~-0.1 ~ air 0 tp @s ^ ^ ^2
(Repeat, unconditional, need redstones)

2. execute @e[type=item,name=Cobweb] ~ ~ ~ particle minecraft:explosion_particle ~ ~ ~
(Chain, conditional, always active)

3. execute @e[type=item,name=Cobweb] ~ ~ ~ fill ~1 ~1 ~1 ~ ~ ~ web 1 replace air
(Impulse, unconditional, need redstones)

4. kill @e[type=item,name=Cobweb]
(Chain, conditional, always active)

5. give @p web
(Chain, conditional, always active)

6. execute @e ~ ~ ~ detect ~ ~ ~ web 0 effect @s slowness 1 200 true
(Repeat, unconditional, need redstones)

Part 2.

1. execute @e[type=item,name=Cobweb] ~ ~ ~ execute @e[r=2,type=!item,type=!arrow,type=!Player] ~ ~ ~ fill ~1 ~1 ~1 ~ ~ ~ web 1 replace air
(Repeat, unconditional, always active)

2. kill @e[type=item,name=Cobweb]
(Chain, conditional, always active)

3. give @p web
(Chain, conditional, always active)

String

Part 1.

1. execute @p ~ ~ ~ execute @e[type=item,name=String] ~ ~ ~ detect ~ ~-0.1 ~ air 0 tp @s ^ ^ ^3
(Repeat, unconditional, need redstones)

2. execute @e[type=item,name=String] ~ ~ ~ particle minecraft:explosion_particle ~ ~ ~
(Chain, conditional, always active)

3. execute @e[type=item,name=String] ~ ~ ~ summon endermite ~ ~ ~
(Impulse, unconditional, need redstones)

4. kill @e[type=item,name=String]
(Chain, conditional, always active)

5. give @p string
(Chain, conditional, always active)

6. execute @p ~ ~ ~ tp @p ^ ^ ^2 facing @e[type=endermite]
(Repeat, unconditional, need redstone)

7. execute @p ~ ~ ~ kill @e[r=1,type=endermite]
(Chain, conditional, always active)

Part 2.

1. execute @p ~ ~ ~ testfor @e[r=100,type=item,name=String]
(Repeat, unconditional, always active)

2. kill @e[type=item,name=String]
(Impulse, unconditional, need redstones)

3. give @p string
(Chain, conditional, always active)