Inferno 
Deals damage to a target equal to 30% of ATK plus 80% of DEF with a 70% chance of inflicting DEF Down for 2 turns.
Lvl 2 Damage increased to 60%
Lvl 3 Chance to trigger increased to 60%
Lvl 4 Damage increased to 70%
Lvl 5 Chance to trigger increased to 60%
Lvl 6 Damage increased to 80%
4 Enters Standoff for 1 turn and resets the cooldown for True Warrior upon suffering a fatal injury. Whenever Black Tortoise’s DEF is higher than the target’s, he deals bonus damage equal to the percentage of how much higher his DEF is compared with the target’s. (max: 40%)
Enters Standoff for 1 turn and resets the cooldown for True Warrior upon suffering a fatal injury, granting counterattacks and restoring 30% HP upon ending. Whenever Black Tortoise’s DEF is higher than the target’s, he deals bonus damage equal to the percentage of how much higher his DEF is compared with the target’s. (max: 40%)
Lvl 2 Cooldown reduced by 1 turn(s)
Lvl 3 Cooldown reduced by 1 turn(s)
4 Deals damage to all enemies equal to 100% of DEF with a 50% chance of inflicting Taunt for 1 turn. If the target has a lower DEF than Black Tortoise, then the chance of inflicting the debuff doubles.
Lvl 2 DEF-damage conversion ratio increased to 45%
Lvl 3 Chance to trigger increased to 40%
Lvl 4 DEF-damage conversion ratio increased to 50%
Lvl 5 Chance to trigger increased to 50%
Lvl 6 Cooldown reduced by 1 turn(s)
Good tank that cannot be 1 shotted
Can AoE taunt enemies (skill resets if he takes lethal damage
Skill 1 can defense break
Strong against AoE teams in PvP
Can solo apep end game with really good relics
If built slow, he can be crowd controlled easily if without resistance
Getting defense broken lowers his damage
Ren Si (Black Tortoise) is a 4 stars Inferno Defender esper in Dislyte.
Ren Si is quite a good tank and shines in both PvE and PvP content. Although he is a tank, he can deal some decent damage if built with enough defense stat. He can apply defense break on skill 1. His passive ensures he gets to live long enough to at least take a turn. His skill 3 is an AoE taunt that can help divert attention away from your team.
As such, in PvP, he is a good unit alongside other units that cannot be one shotted such as Hyde to annoy opponents and also foiling plans against cleave.
In PvE, he is a solid tank to help land defense breaks. He can be a viable option for Kronos if you have trouble surviving there. As will often get targeted for the rock drop and survive as a result of his passive. This will buy time for your other DPS to take him down.
Also, he becomes quite good for Apep 10 solo once you can get him a decent Hades/Avatara set with def% and crit rate/crit damage stats on him. This is more late game though, so don't expect to do this when you are trying to build a starter team.
Wind Walker x4
SPD +25%
Stoneveins x2
DEF +25%
DEF%
RESIST% / DEF%
SPD
Hades x4
+35% Lifesteal
Stoneveins x2
DEF +25%
DEF%
DEF%
SPD / DEF%
Snow Dowager x4
Grants a 20% chance of Freezing the target for 1 turn when taking damage.
Stoneveins x2
DEF +25%
DEF%
RESIST% / DEF%
DEF%
Tyranny of Zeus x4
Damage dealt has a 20% chance of Stunning the target for 1 turn.
Stoneveins x2
DEF +25%
DEF%
DEF%
SPD / DEF%
HP%
SPD
ACC%
Flat DEF
| Level | Atk | HP | Def | Spd |
|---|---|---|---|---|
| 1 | 184 | 2607 | 252 | 98 |
| 60 | 831 | 11749 | 1143 | 98 |
| C. Rate | C. Damage | Acc | Resist |
|---|---|---|---|
| 10% | 150% | 0% | 20% |
Basic Inferno Wave x15
Basic Inferno Wave x20 
Basic Inferno Wave x25 
Advanced Inferno Wave x15
Advanced Inferno Wave x20 
Elite Inferno Wave x10
Advanced Inferno Wave x30
Elite Inferno Wave x15
Advanced Inferno Wave x40
Elite Inferno Wave x30