There are a few addons to riffs with 0 on last string, but i think, you're able,
to hear it while listening to the song :)
intro (generally, i think it's synth, but if someone wants to play it, it could
be played as bass) x8
tuning - all strings 2 steps down
|--------------------------|
|--------------------------|
|--------------------------|
|-0-0-0-0-0-0-0-0-0-0-0-0-1|
bass riff 1 x4
|----------------------|
|----------------------|
|---------2-2-2-2------|
|-0-0-3-5---------5-3--|
bass riff 2 x2
|-----------------|
|-----------------|
|-7-5-3--5-3-2-3--|
|-----------------|
bass part x 4
|-----------------------|
|-----------------------|
|----------2-2-22-------|
|--0-0-3-5---------5-3--|
bass riff 1 x 4
|-----------------------|
|-----------------------|
|----------2-2-22-------|
|--0-0-3-5---------5-3--|
bass riff 2 x4
|-------------------|
|-------------------|
|-7-5-3--5-3-2-3--|
|-------------------|
bass riff 3 x2
|---------------------------------------------------|
|---------------------------------------------------|
|-------------3-3-3-3-3-3-2-2-2-2-2-2h3p2-0h2p0-0---|
|-0-0-0-0-0-0-------------------------------------0-|
bass riff 1 x4
[ Tab from: https://www.guitartabs.cc/tabs/s/samael/moongate_btab.html ]
|-----------------------|
|-----------------------|
|p----------2-2-22------|
|s--0-0-3-5---------5-3-|
bass riff 4 x4
|----------|
|----------|
|-3-1------|
|------2-3-|
bass riff 2 x2
|-------------------|
|-------------------|
|-7-5--3--5-3-2-3---|
|-------------------|
bass riff 3 x4
|-----------------------------------------------------|
|-----------------------------------------------------|
|-------------3-3-3-3-3-3-2-2-2-2-2-2-2h3p2-0h2p0-0---|
|-0-0-0-0-0-0---------------------------------------0-|
bass riff 5 x8
|-----------------------------------------|
|-----------------------------------------|
|-----------------------------------------|
|-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0-|
bass riff 6 x4
|---------|
|---------|
|---------|
|-0-0-0-0-|
bass riff 4 x2
|-----------|
|-----------|
|-3-1-------|
|------2-3--|
bass riff 3 x4
|-----------------------------------------------------|
|-----------------------------------------------------|
|-------------3-3-3-3-3-3-2-2-2-2-2-2-2h3p2-0h2p0-0---|
|-0-0-0-0-0-0---------------------------------------0-|
bass riff 6 x4
|-----------------------------|
|-----------------------------|
|---------3-3-3-3-2-2-2-2-2-2-|
|-0-0-0-0---------------------|
end
|---|
|---|
|---|
|-0-|
