Pisces is a watery sign with complete darkness. Fiery planets Sun and Mars will struggle there while Saturn will do fine there, Mercury is kind of neutral to good.

8th house is natural Saturn signification, by Kapalpurusha : Mars is emotional there, Mercury is uncomfortable there, Sun also is not very comfortable with water.

Final results will depend on who is ahead in degrees, Saturn should be behind always being slowest.

1) Saturn in the eight should promise a long life.
2) Sun being lagna lord placed in 8th – gives a fighting personality – could be research oriented – willing to go into details.
3) Mercury being 2nd/11th lord – wealth and earning could have sudden changes.
4) Mars -4th,9th lord in 8th – could bring in lot of hurdles in fortune of the native.
5) Check the latitudes and Navamsa positions
6) If planets are in graha yudha – most significations are lost on both sides – winning planets may give 50percent result – while lost planet cannot give any result.

1) Sun and Mars in 8th can give poor health, surgeries, fevers, but good for income.
2) Sun and Mercury in 8th can give poor grasp at school level – however Sun being lagna lord here develops talent later on. Loss of Money/ Jewellery.
3) Sun, Saturn in 8th can indicate injuries, accidents, long term life but ill health- being dire enemies.
4) Mars and Saturn makes one very bold. He can join police / army / criminal gangs / stunt masters / gymnastics – same thing can attributed to above Sun-Sat combo.
For any such combinations, please look from which houses these planets are in upachayas. Planets in Upachayas (3,6,10,11) to any house improve those significations offered by the planet. Similarly planets in marana karaka sthanas from any house – tend to destroy that house.

Regards,